JPH08179180A - Lens barrel for image input device using one-dimensional image pickup element - Google Patents

Abstract

PURPOSE: To easily assemble an optical system without deteriorating the performance of an image input device having a line sensor used for an image pickup element. CONSTITUTION: This lens barrel 10 is split into a lens barrel main body 13 and an external lens barrel. The external shape of the lens barrel main body 13 is made cylindrical, and a projection part 31 or a recessed part is provided at the end of the lens barrel main body 13. And also, a through-hole 43 in which the lens barrel main body 13 is inserted is provided on the external lens barrel, and a rotation locking means 48 protruded in the through-hole 43 is provided on the external lens barrel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image input device using an image sensor of a line sensor, and more particularly to a lens barrel of an image forming optical system in which a plurality of lenses in the image input device are combined. is there.

[0002]

2. Description of the Related Art Today, an image input device such as an image scanner which reads various figures and printed characters and converts them into electric signals is widely used. In many cases, these image input devices use a two-dimensional solid-state imaging device or a one-dimensional solid-state imaging device, irradiate a target surface to be read with light, and combine reflected light or transmitted light from the target surface with a plurality of lenses. An image is formed on the one-dimensional solid-state imaging device or the two-dimensional solid-state imaging device by using the lens group.

The image forming optical system of the image input / output device is usually mounted on the input window 61 of the image input device 60 on the image pickup device 65 fixed at a predetermined position, as shown in FIG. A lens barrel 11 having a fixed lens group is arranged so as to form a surface image of an object, and an image obtained through an input window 61 is guided to the lens barrel 11 by a reflecting mirror 63, and an image pickup element by the lens group. It is designed to form an image on top of 65.

In this image forming optical system, generally, as shown in FIG. 9, a fixing screw 69 is inserted into a screw insertion hole 68 formed in a required portion of the apparatus main body of the image input apparatus 60,
A fixing screw 69 is screwed into the leg portion 14 of the lens barrel 11 to fix the lens barrel 11 to a part of the apparatus body, and a plurality of lenses are inserted into the through holes 17 formed in the lens barrel 11, A first separation ring 25 is provided between the first lens 21 and the second lens 22 as necessary, and a second separation ring 27 is provided between the second lens 22 and the third lens 23 as necessary. Insert the appropriate number of lenses
, 22, and separation rings 25, 27 are inserted, a required number of lenses are inserted into the through holes 17, and then a holding ring 29 is inserted into the through holes 17 to fix the lens group.

A flange portion 15 is formed at one end of the through hole 17 to reduce the diameter of the through hole 17, and the lenses 21, 22, 23 and the separation ring 25 are inserted into the through hole 17 having the reduced one diameter. , 27, and finally the press ring 29 is inserted to fix the lens group. Not only the lens barrel 11 that fixes the lens group, the press ring 29 is fixed to both ends of the through hole 17 and is placed between the two press rings 29. There is also a lens group in which a plurality of lenses are fixed.

Further, in this lens group, a plurality of lenses are used in order to remove various aberrations which cause deterioration of optical performance. Usually, the lenses and fixing means of the lenses are the components of the imaging optical system. The shape is rotationally symmetrical about the optical axis,
It is assumed that each lens satisfies a predetermined optical performance in a planar area that is rotationally symmetrical with respect to the optical axis center on the image plane while being held at an arbitrary rotation angle with respect to the optical axis center of the imaging optical system. ing.

[0007]

As described above, in the image forming optical system of the image input apparatus, in general, the lens groups are arranged such that the predetermined optical performance is satisfied in a plane area which is rotationally symmetrical about the optical axis. Although configured, in a line sensor such as a one-dimensional solid-state image pickup device, it is sufficient if a predetermined optical performance is satisfied in a linear region having a line symmetry with respect to the optical axis center on the image plane.

However, the rotational angle position where the lens is fixed with respect to the arrangement of the line sensor is not fixed, and as an image forming optical system using this lens group, a straight line of all angles passing through the optical axis center on the image plane. There is a problem that a predetermined optical performance is required in the curved area, and as a result, the predetermined optical performance needs to be satisfied in a planar area that is rotationally symmetrical about the optical axis.

[0009]

According to the present invention, a lens barrel is divided into a lens barrel main body and a lens barrel outer cylinder, the lens barrel main body has a cylindrical outer shape, and a projection portion is provided at an end of the lens barrel main body. Alternatively, a concave portion is provided, a through hole for inserting the lens barrel main body is provided in the lens barrel outer cylinder, and a rotation locking means that can project into the through hole is provided in the lens barrel outer cylinder.

The rotation locking means may be formed by providing a set screw for projecting the tip into the through hole,
In some cases, a notched opening is formed in the lens barrel outer cylinder, and an elastic body positioned at the notched opening is pressed against the outer peripheral surface of the lens barrel body to serve as a rotation locking means. In addition, a first screw such as a male screw is formed on the outer periphery of the lens barrel main body having a cylindrical outer shape, and a second screw that is screwed with the first screw of the female screw is formed in the through hole of the lens barrel outer cylinder. Then, the lock nut may be fitted to the lens barrel body.

Further, when a male screw is formed on the outer circumference of the lens barrel body, a projection may be provided at the end of the lens barrel body.
In addition, the lens barrel outer cylinder may be attached to the apparatus main body so as to be movable and adjustable in the optical axis direction. Then, the lens barrel body may be provided with a mark indicating a diametrical direction with high optical performance.

As described above, a cylindrical lens barrel main body having a plurality of lenses built therein is provided with a mark indicating a diametrical direction having high optical performance, and the lens barrel main body is fixed in the image input device. The lens barrel body is fixed to the outer cylinder by aligning the direction of the mark with the axial direction of the one-dimensional image sensor.

[0013]

According to the present invention, the lens barrel is separated into the lens barrel body and the lens barrel outer barrel, and the lens barrel can be fixed to the apparatus body by the lens barrel outer barrel. Further, since the outer shape of the lens barrel main body is cylindrical and the lens barrel main body is inserted into the through hole of the lens barrel outer cylinder,
The lens barrel main body can be rotated with respect to the lens barrel outer cylinder, and since the protrusion is provided at the end of the lens barrel main body, the protrusion can easily adjust the rotational angle position of the lens barrel main body. it can.

Further, since the lens barrel outer cylinder is provided with the rotation locking means that can project into the through hole, the lens barrel body can be easily fixed to the lens barrel outer cylinder. If a set screw is used as the rotation locking means, the set screw can be loosened to rotate the barrel body, and tightening the set screw ensures that the barrel body does not rotate. The rotation locking means that can lock the elastic body and presses the elastic body against the outer peripheral surface of the lens barrel body easily rotates the lens barrel body by lifting the elastic body to bring the elastic body into contact with the lens barrel body. The rotation of the lens barrel body can be prevented.

The lens barrel has a lens barrel main body and a lens barrel outer cylinder, a first screw is formed on the outer periphery of the lens barrel main body, and a second screw is formed on the lens barrel outer cylinder. Since the main body can be screwed into the lens barrel outer tube and the lock nut is fitted to the lens barrel body, the lens barrel body can be fixed to the lens barrel outer tube at a predetermined angle at a predetermined position. Further, the lens barrel main body having the first screw formed on the outer periphery of the lens barrel main body and the projection portion provided at the end is
It is easy to rotate the lens barrel body by the protrusion.

If the lens barrel outer cylinder can be moved and adjusted in the optical axis direction, even if the male screw provided on the lens barrel main body and the female screw pitch provided on the lens barrel outer cylinder are made coarse, the lens barrel is always connected on the image pickup element. The rotation angle of the lens barrel main body can be fixed at an arbitrary position while making an image. Further, in the lens barrel main body in which a mark showing a diametrical direction with high optical performance is provided on the lens barrel main body, the direction with high optical performance becomes obvious, and it becomes easy to match the orientation of the lens barrel main body with the orientation of the image sensor. .

If the lens barrel body is fixed to the lens barrel outer cylinder by aligning the direction of the mark showing the diameter direction having high optical performance with the axial direction of the one-dimensional image pickup device, the highest performance of the lens group can be utilized. As a result, a good object image can be formed on the image sensor.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lens barrel for an image input device according to the present invention is, as shown in FIG. 1, a lens barrel outer cylinder 41 for fixing the lens barrel 10 to the device body of the image input device 60, It is divided into a lens barrel main body 13 having a plurality of lenses 21, 22, ... Fixed therein. This lens barrel main body 13 has a cylindrical shape, and an appropriate number of lenses 21, 22, ... Are fixed therein by using split rings 25, 27 as in the conventional case.

The lens barrel body 13 is provided with a rod-shaped protrusion 31 at its end, and the lens barrel outer cylinder 41 is provided with a through hole 43.
The lens barrel body 13 is inserted into the through hole 43. In addition, the diameter of the through hole 43 is substantially matched with the outer shape of the lens barrel body 13,
The lens barrel body 13 inserted into the through hole 43 can be slid in the axial direction and rotated about the axial direction without rattling.

The lens barrel outer cylinder 41 is provided with a screw hole 47 penetrating from the outside of the lens barrel outer cylinder 41 to the through hole 43 at the side wall of the through hole 43. A set screw 48 that can be projected into the inside of 43 is screwed into the rotation locking means. Further, the lens barrel outer cylinder 41 has a leg portion 45.
Is provided so that it can be stably and reliably fixed to the apparatus main body, and the axis of the lens barrel main body 13 is aligned with the center of the CCD line sensor as the image pickup device 65 incorporated in the image input device 60 and is placed at a predetermined position. It is attached.

In this embodiment, the lens barrel 10 is thus divided into the lens barrel body 13 and the lens barrel outer cylinder 41, and the lens barrel body 13 is slidable and rotatable with respect to the lens barrel outer cylinder 41. At the same time, since it can be fixed by the set screw 48 which is the rotation locking means, the fixing screw 69 inserted into the screw insertion hole 68 is screwed into the leg portion 45 and the lens barrel outer cylinder
While fixing 41 to the apparatus main body, the lens barrel main body 13 can be slid in the axial direction to finely adjust the distance to the CCD line sensor that is the one-dimensional image pickup element 65, and the optical performance of the lens group can be improved. Even if there are variations depending on the diametrical direction, the lens barrel main body 13 can be rotated to match the diametrical direction in which the optical performance is improved with the axial direction of the CCD line sensor, which is the image pickup element 65. After adjusting the distance from the line sensor and the rotation angle, the lens barrel main body 13 can be securely fixed to the lens barrel outer cylinder 41 by screwing the set screw 48.

In addition, when a predetermined lens is incorporated in the lens barrel body 13 and the lens barrel 10 is assembled by the lens group, when performing the optical performance test, a mark 33 indicating the diameter direction in which the optical performance is highest is clearly indicated. It is preferable to attach the lens barrel body 13. As described above, the lens barrel body 13 provided with the mark 33 indicating the diametrical direction, in which the evaluation of the optical performance is high, is C
The axial direction of the CD line sensor and the direction in which the lens group has high optical performance can be easily matched, and the resolution and the like of the image input device 60 can be easily maintained high.

Further, in the above-described embodiment, the lens barrel body 13 is provided with the rod-shaped protrusion 31, but the protrusion 31 is cylindrical.
In some cases, a ring-shaped flange is extended outward, and the outer shape of the flange is polygonal to form the protrusion 31. Furthermore,
As another embodiment, as shown in FIG. 2, a recess such as a crab hole 38 may be provided at the end of the lens barrel body 13, and in this case as well, the set screw 48 is loosened and the claw hole 38 is By inserting a jig and rotating the lens barrel body 13 easily, the position between the axial direction of the CCD line sensor and the direction with high optical performance can be adjusted. After adjusting the position, the set screw 48 is screwed into the mirror. Tube body 13
Can be fixed.

Further, the formation of the recess is not limited to the crab-shaped hole 38, but may be formed as a notch 39 as shown in FIG. As described above, the concave portions such as the crab holes 38 and the cutout portions 39 allow the lens barrel main body 13 to be easily rotationally adjusted by using a jig.
There is an advantage that the lens barrel body 13 is not inadvertently rotated by being impacted with the lens barrel body 13 at the time of maintenance and adjustment of the 60.

Further, as shown in FIG. 3, a notch opening 49 having a required width is provided in the lens barrel outer cylinder 41, and a mirror to be inserted into the through hole 43 of the lens barrel outer cylinder 41 by this notch opening 49. With the outer peripheral surface of the barrel main body 13 exposed, as shown in FIG.
A pressing spring 51, which is an elastic body, is fixed by a mounting screw 55, and a part of the pressing spring 51 is pressed against the outer circumference of the lens barrel body 13 to serve as a rotation locking means for locking the rotation of the lens barrel body 13. There is also.

The pressing spring 51 is not only fixed to the lens-barrel outer cylinder 41, but is fixed inside the apparatus body near the lens-barrel outer cylinder 41, and a part of the pressing spring 51 is cut out into an opening 49. It suffices if it is positioned so that it projects into the through-hole 43.If the tip of the presser spring 51 is used as the finger hook 53, the presser spring 51 can be adjusted when rotating the position of the lens barrel body 13. The lens barrel body 13 can be easily rotated by rotating it.

Further, as another embodiment, as shown in FIG. 5, a male screw is formed as the first screw on the outer periphery of the lens barrel body 13, and the first screw is formed in the through hole 43 of the lens barrel outer cylinder 41. Second screwed with
By forming a female screw as a screw, the lens barrel main body 13 can be screwed into the lens barrel outer cylinder 41. In this embodiment, a through hole formed with a second screw
When inserting and fixing the cylindrical lens barrel main body 13 having the first screw formed in 43, as in the embodiment shown in FIG. 1, a screw hole 47 communicating with the through hole 43 from the outside is provided and a set screw 48 is provided. Not only when the lens barrel main body 13 is fixed to the lens barrel outer cylinder 41 by screwing, but also as shown in FIGS. 5 and 6, a lock nut 35 is fitted to the lens barrel main body 13 to fix the lens barrel main body 13 to the lens barrel main body 13. After screwing the lens barrel outer cylinder 41 by a predetermined amount to determine the distance from the CCD line sensor and the rotation angle, the lock nut 35 is screwed into the lens barrel body 13 to lock the lock nut 35 of the lens barrel outer cylinder 41. The lens barrel main body 13 is fixed to the lens barrel outer cylinder 41 by pressure contact with the end portion.

The pitch of the first screw provided in the lens barrel body 13 and the second screw provided in the through hole 43 is reduced to reduce the lens barrel body.
Not only is it possible to finely adjust the axial movement amount of the lens barrel body 13 when the lens barrel body 13 is rotated half a turn, but also a screw insertion hole 68 provided in the device body for fixing the lens barrel outer cylinder 41 to the device body. Is a long hole, and the position where the lens barrel outer cylinder 41 is fixed to the apparatus body can be adjusted in the axial direction of the lens barrel 10, the pitch of the first screw and the second screw is made slightly rough, and the lens barrel body 13 It is possible to easily form the lens barrel outer cylinder 41.

Further, when forming the first screw in the lens barrel body 13, the case is not limited to the case where the first screw is formed over the entire outer circumference of the lens barrel body 13, but as shown in FIG. 13
The projection portion 31 may be provided with a polygonal flange at the end of the lens barrel main body 13 having the projection portion 31 and formed with the first screw. The barrel body
By inserting the lens barrel outer cylinder 41 shorter than 13 in length, it can be fixed to the lens barrel outer cylinder 41 using the lock nut 35.

Thus, the lens barrel body 13 in this embodiment
The cylindrical outer shape allows the lens to be fixed at any rotational angle position for fixing, and by providing the mark 33 indicating the diametrical direction with high optical performance on the lens barrel body 13, It is easy to align the high-performance diametrical direction with the axial direction of the CCD line sensor that is the image sensor 65, and by providing the protrusion 31 on the lens barrel body 13, it is easy to adjust the rotational angle position when fixing. The image input device having high performance can be easily assembled.

If the axial direction of the one-dimensional image pickup device 65 is aligned with the direction of the mark 33 indicating the diametrical direction with high optical performance, and the lens barrel body 13 is inserted and fixed in the lens barrel outer tube 41, a plurality of lenses are formed. It is possible to form a good image on the CCD line sensor by using the optical system constituted by the above with the highest performance.
After the lens barrel body 13 is positioned so as to be aligned with the axial direction of the image sensor 65, the lens barrel body 13 can be securely fixed to the lens barrel outer cylinder 41 using an adhesive.

[0032]

According to the present invention, there is provided a lens barrel including a cylindrical barrel main body accommodating a lens and a barrel outer cylinder having a through hole into which the barrel main body is inserted. Since it is rotatable with respect to the outer cylinder, even if the optical performance of the lens group varies in the diameter direction, the resolution of the image input device can be adjusted by aligning the diameter direction with good optical performance with the axial direction of the line sensor. A lens barrel for an image input device capable of maintaining a high lens barrel, in which a projection portion or a concave portion facilitates adjustment of a rotation angle of the lens barrel body, and a rotation locking unit allows the lens barrel body to be easily mounted. It can be fixed at a predetermined position and a predetermined angle.

If a set screw is used as the rotation locking means, the body of the lens barrel can be securely fixed after the rotation angle is adjusted, and if an elastic body is used as the rotation locking means, the rotation locking means can be extremely fixed. There is an advantage that the rotation locking of the lens barrel body can be easily released and the rotation of the lens barrel body can be easily adjusted.
In addition, a lens barrel in which a first screw is formed on the outer periphery of the lens barrel body, a second screw is formed in a through hole to be screwed with the first screw, and a lock nut is fitted to the lens barrel body is a lens barrel body. The angle of the lens and the distance from the line sensor can be adjusted by the screwing amount of the lens barrel, and the lens barrel body can be fixed to the lens barrel outer cylinder at a predetermined angle and position by a lock nut.

The lens barrel body having the projection and the first screw formed on the outer periphery of the lens barrel body has an advantage that the position of the lens barrel body can be easily adjusted by the rotation of the lens barrel body. Further, when the lens barrel outer cylinder is attached to the apparatus main body so as to be adjustable in the axial direction, the pitch of the screws formed on the lens barrel main body can be made somewhat coarser, and the lens barrel can be easily manufactured.

In the case of a lens barrel body having a mark on the lens barrel body, it is extremely easy to match the diameter direction of the axis of the line sensor having a high optical performance with the mark. Further, the lens barrel in which the mark of the lens barrel main body is fixed to the axial direction of the one-dimensional image sensor and the lens barrel main body is fixed to the lens barrel outer cylinder is an image sensor using good performance of an optical system by combining lenses. A desired image is formed on the lens, image processing with good image quality is possible, and the advantage of facilitating the assembly of the lens barrel and satisfying the yield of the combined lens by satisfying the predetermined optical performance in the usage range. It will have the advantage that improvements can be made.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a lens barrel according to the present invention.

FIG. 2 is a view showing another embodiment of the lens barrel body of the lens barrel according to the present invention.

FIG. 3 is an exploded perspective view showing a second embodiment of the lens barrel according to the present invention.

FIG. 4 is a perspective view showing the assembled state of the second embodiment of the lens barrel according to the present invention.

FIG. 5 is an exploded perspective view showing a third embodiment of the lens barrel according to the present invention.

FIG. 6 is a perspective view showing an assembled state of a third embodiment of the lens barrel according to the present invention.

FIG. 7 is a perspective view of essential parts showing an improved example of the third embodiment of the lens barrel according to the present invention.

FIG. 8 is a diagram showing an outline of an image input device.

FIG. 9 is an exploded perspective view showing an example of a conventional lens barrel for an image input device.

[Explanation of symbols]

 10, 11 Lens barrel 13 Lens barrel main body 15 Collar part 17 Through hole 21, 22, 23 Lens 25, 27 Separation ring 29 Holding ring 31 Protrusion part 33 Mark 35 Lock nut 38 Crab eye hole 39 Notch part 41 Outside the lens barrel Tube 43 Through hole 45 Leg 47 Screw hole 48 Set screw 49 Notch opening 51 Holding spring 53 Finger hook 55 Mounting screw 60 Image input device 61 Input window 63 Reflector 65 Image sensor

Claims (8)

[Claims] 1. A lens barrel is divided into a barrel main body and a barrel outer cylinder, the outer shape of the barrel main body is made cylindrical, and a projection or a recess is provided at an end of the barrel main body. A one-dimensional imaging, wherein the lens barrel outer cylinder has a through hole into which the lens barrel main body is inserted, and the lens barrel outer cylinder has a rotation locking means that can project into the through hole. A lens barrel for an image input device using an element. 2. The rotation locking means has a screw hole penetrating from the outer circumference of the barrel outer cylinder to the through hole, and the screw hole has a set screw whose tip can project into the through hole. A lens barrel for an image input device using the one-dimensional image pickup device according to claim 1, wherein the lens barrel is screwed. 3. As the rotation locking means, a cutout opening is provided in the lens barrel outer cylinder, and an elastic body fixed to the lens barrel outer cylinder or in the vicinity thereof is positioned in the cutout opening. A lens barrel for an image input device using a one-dimensional image pickup device, characterized in that a part of an elastic body is made to project inside the through hole. 4. A lens barrel is divided into a lens barrel body and a lens barrel outer barrel, the lens barrel body has a cylindrical outer shape, and a first screw is provided on the outer circumference of the cylindrical lens barrel body. And a through hole for inserting the lens barrel main body is formed in the lens barrel outer cylinder, and a second screw which is screwed with the first screw is formed in the through hole, and is fixed to the lens barrel main body. A lens barrel for an image input device using a one-dimensional image pickup device, characterized in that a nut is fitted. 5. A protrusion is provided at an end of the lens barrel body,
A lens barrel for an image input device using the one-dimensional image pickup device according to claim 4. 6. The one-dimensional image pickup device according to claim 4, wherein the lens barrel outer cylinder is attached to the apparatus body so as to be movable and adjustable in the optical axis direction. Lens barrel for image input device. 7. The one-dimensional imaging device according to claim 1, wherein the lens barrel body has a mark indicating a diametrical direction with high optical performance in the lens barrel body. A lens barrel for an image input device using the. 8. A lens barrel outer body for fixing a lens barrel body inside an image input device, wherein a cylindrical lens barrel body containing a plurality of lenses has a mark indicating a diametrical direction with high optical performance at an end thereof. An image input device using a one-dimensional image sensor, comprising a cylinder, wherein the direction of the mark coincides with the axial direction of the one-dimensional image sensor and the lens barrel main body is fixed in the lens barrel outer cylinder. Lens barrel for.