JPS58115971A - Optical device for facsimile - Google Patents

Abstract

PURPOSE:To attain the adjustment in which azimuth, magnification and focus can be adjusted independently relating to individual conditions, by providing a hole exposing cross section in the broadwise direction of a groove at the outer side cylinder of the groove, and displacing the position of the groove at each hole. CONSTITUTION:A sensor holding cylinder 5 is supported in a cylinder 4 of a fixed support block 1 freely movably toward the axial and circumferential direction of an optical axis 3 and supported in the sensor holding cylinder 5 movably toward the lens cylinder 6 and the light axis 3, then the adjustment of the azimuth, magnification and focus is done independently. A slit 8 and a pickup sensor 10 are kept always orthogonal at the rear end of the cylinder 5 to be coincident with the light axis 3, then the squareness of the sensor 10 to the axis 3 requires no adjustment. Since a circumferential or axial groove 24 for the position alignment is exposed externally from a hole 21, the adjustment is done externally, and the cylinders 5 and 6 are assembled concentrically in the inside of the block 2 so as to be overlapped with good arrangement.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical device used for facsimile, etc.
In particular, it relates to adjustment means such as azimuth, magnification and focus.

The photoelectric conversion unit of a facsimile focuses the scanning light of the original image using an optical system and guides it through a slit to a linear image sensor such as a CCD (charge-coupled device). is converting.

Therefore, regarding the optical system, conditions such as magnification adjustment, focusing on the image sensor, matching of the scanning slit and the sensor line, and orthogonality between the scanning and the optical axis are required.

Conventionally, these adjustments have been satisfied with general adjustment means such as alignment, but these are not sufficient. In particular, when adjusting one condition, the other condition is affected in a correlated manner, so the adjustment operation cannot generally be performed uniformly, and problems remain in terms of adjustment efficiency.

Therefore, an object of the present invention is to enable independent adjustment for each condition, to make the adjustment simple and reliable, and to simplify the structure of the adjustment part.

Based on the above object, the present invention supports a sensor holding tube rotatably and slidably on a fixed support block, attaches a slit and a linear image sensor to the rear end of the sensor holding tube, and A lens barrel is slidably supported within the sensor holding barrel, and the sensor holding barrel is further provided with means for adjusting the longitudinal position (focus) of the lens barrel, and the support block is provided with means for adjusting the longitudinal position (magnification) of the sensor holding barrel. A means for adjusting the rotational position (azimuth) is provided. The positional relationship between the slit and the image sensor and the perpendicularity between the optical axis and the image sensor are determined by using the machining accuracy of the rear end surface of the sensor holding cylinder, the accuracy of the sensor support, etc., and bring them into contact directly or through a plate, etc. This alone makes it possible to eliminate adjustments. Therefore, the only adjustment of the optical system is focus, back focus, zero magnification (optical path length), and azimuth (rotational position), and these adjustment amounts are made to be almost independent of each other.

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

First, FIGS. 1 to 4 show an optical device 1 using a single lens system for facsimile. This optical device 1 is integrated into a stationary support block 20 part. This support block 2 forms a cylindrical portion 4 concentric with the optical axis 3. This cylinder part 4 has a sensor holding cylinder 5 that can freely rotate around the optical axis 3 in its interior 3).
Moreover, it is held slidably in the direction of the optical axis 3, and the sensor holding cylinder 5 supports a lens barrel 6 inside thereof so as to be slidable in the direction of the optical axis 3.

The sensor holding cylinder 5 holds a plate 9 having a slit 8 and an image sensor 10 on a contact surface 7 at the rear end. The contact surface 7 is machined with high precision so as to constitute a plane perpendicular to the optical axis 3. Therefore, the plate 9 has the mounting screws 1 inserted into its four mounting holes 11.
When the plate 9 is attached to the contact surface 7 by the plate 2, the back surface of the plate 9 is perpendicular to the optical axis 3. Of course plate 9
The center point of the slit 8 coincides with the optical axis 3.

An image sensor 10 is placed on the back side of this slit 8. The image sensor 10 is attached to one socket 13, and a linear charge-coupled device 15 within the light receiving window is exposed to the slit 8. Note that there is a recess 1 on the back side of the slit 8 through a part of the plate 9.
4 is formed, and the image sensor 10 is
) The surface of the light receiving window does not directly contact the opening of the slit 8. The socket 13 is attached to a circuit board 16, and the circuit board 16 is inserted into the mounting hole 19 of the circuit board 16 with a spacer 17 fixed to the plate 9 interposed between the socket 13 and the plate 9. It is fixed by a mounting screw 18 inserted into a screw hole 20 of the spacer 17.

Here, the height of the spacer 17 is set to be slightly smaller than the height of the image sensor 10 and the socket 13 when they are combined, so the tightening force of the mounting screw 18 is applied to the outside of the light receiving window of the image sensor 10. This is the force that presses the edge to the back surface of the plate 9.

On the other hand, the support block 2 rotatably supports an adjustment shaft 22 through a hole 21 below the cylindrical portion 4.

The adjustment shaft 22 is provided with an eccentric pin 22 on the inner side of the cylindrical portion 4. This eccentric pin 22 is for azimuth adjustment, and the optical axis 3 is formed at the tip of the sensor holding cylinder 5.
It fits inside the groove 24 in the direction of. Also, the cylindrical part 4
rotatably supports an adjustment shaft 26 inside a hole 25 in its upper portion, and an eccentric pin 27 for magnification adjustment integral with this adjustment shaft 26 is formed in the circumferential direction of the sensor holding cylinder 5. It is tucked inside the groove 28. Further, the sensor holding cylinder 5 has a hole 30 formed at the position of the escape hole 29 formed on the upper surface of the cylinder part 4, and the adjustment shaft 31 is formed at the hole 300.
is rotatably supported. An eccentric pin 32 for focus adjustment is also integrally formed on this adjustment shaft 31. It's really crowded. These adjusting shafts 22, 26, 31 are each connected to a set screw 34.
35° 36 and is held down by disc springs 37, 38, and 39. In addition, set screws 34, 35, 36
are screwed into screw holes 40 and 41 of the cylinder portion 4 and screw holes 42 of the sensor holding cylinder 5, respectively. In this way, the rotation direction of the sensor holding cylinder 5 is regulated by the eccentric pin 23 inside the cylinder part 4, and the direction of the multi-optical axis 3 is regulated by the eccentric pin 27, and the lens cylinder 6 is regulated by the eccentric pin 23. Movement in the direction of the optical axis 3 inside the holding cylinder 5 is restricted by an eccentric pin 32 . Of course, this lens barrel 6 internally supports the lens 44 in alignment with the optical axis 3 with an intermediate lever 43 interposed therebetween.

Next, the functions and operations of the optical device 1 will be explained. The perpendicularity of the contact surface 7 of the sensor holding tube 5 to the optical axis 3 can be easily obtained by machining precision, and the flatness of the plate 9 is also sufficient, and the frame of the image sensor 10 (
Since the precision of the molded portion is also good, a sufficient perpendicularity of 1° of the image sensor to the optical axis 3 can be ensured. Therefore, alignment of the optical axis 3 and the image sensor 10 and adjustment of the perpendicularity of the image sensor 10 with respect to the optical axis 3 can be omitted.

The focal point is the optical axis 3 between the image sensor 10 and the lens 44.
This distance is determined by the above distance, but this distance can be set arbitrarily within a range twice the eccentricity of the eccentric pin 32 by rotating the adjustment shaft 31 in either direction with the set screw 36 loosened. In other words, as the adjustment shaft 31 rotates, the eccentric pin 32 rotates on the circumference with the eccentricity as the radius, but the light 17) during rotation is transmitted to the circumferential groove 33. In order to be able to
The lens barrel 6 moves in the direction of the optical axis 3. As the lens 44 moves at this time, an image of the subject is focused on the position of the charge-coupled device 15 of the image sensor 10. Also, the magnification is determined by the distance between the original and the image sensor 10, and that distance is determined by the eccentric pin 2.
7 can be set by rotating the adjustment shaft 26. The azimuth is set in the direction of rotation of the slit 8 of the plate 9 with respect to the slit on the document side, but this rotation direction is determined by rotating the adjustment shaft 22 with the set screw 34 loosened and moving the eccentric pin 23 into the sensor holding tube. Adjustment can be made by displacing it in the circumferential direction of 5. After adjustment, set screw 34.3
5.36 and press the disc springs 37, 38, 39 against the heads of the corresponding adjustment shafts 22, 26, 31, each eccentric pin 23.27° 32 will stably maintain the adjusted rotational position. I will do it. Note that these adjustment ranges are all within twice the eccentricity of the eccentric pins 23, 27, and 32. Adjustment of focal point magnification and azimuth can be made to this extent. and these adjustments (
Since the 8Is are almost independent, the structure is such that adjustment of one has little effect on the other. Therefore, during assembly, these adjustment operations can be carried out sequentially and independently, and therefore the workability is significantly improved compared to conventional ones. Of course, the focus will shift somewhat when adjusting the magnification, but if the amount of displacement by the eccentric pin 27 is set within the depth of field of the lens 44, the blur of the image will be within an acceptable range, so there is no practical problem. .

Next, FIGS. 5 to 8 show an optical device 1 using a zoom lens system for facsimile. In this embodiment, an eccentric pin 23 for azimuth adjustment is also provided above the cylindrical portion 4 in consideration of the adjustment space.

Other basic configurations and functions are almost the same as those of the previous embodiment, so the same parts are designated by the same reference numerals.

However, since the adjustment shaft 31 is long, a clearance groove 45 is formed on the outer periphery of the lens barrel 6 to provide a range of movement in the axial direction and a clearance for the set screw 36. In addition, a fixing plate 4 is located above the front end of the lens barrel 6.
6 is mounting with screws. This fixing plate 46 is fixed by a mounting screw 49 for mounting a gear or a drive motor (not shown) that meshes with a gear 48 of the zoom barrel 47.

The zoom barrel 47 has a groove 50 in the direction of the optical axis 3 on its inner periphery, is rotatably held on the outside of the cam barrel 51, and is prevented from being removed by a retaining ring 52. . The cam cylinder 51 has a sliding ball 53.5 inside it.
4 supports two lens holding frames 55 and 56 so as to be movable in the direction of the optical axis 3, and a mounting screw 5 is attached at the rear end portion.
7 is fixed to the rear of the lens barrel 6. The lens holding frame 56 supports a correction lens 59, and the other lens holding frame 55 supports a variable power lens 58. These lens holding frames 55, 56 each hold a radial guide shaft 60, 61 in a screwed state at a position on the outer periphery, and each of these guide shafts 60, 61 is connected to a roller 62.
．． It holds 63,64.65. One roller 62
．． 64 fit into the cam groove 66 for zooming and the cam groove 67 for correction formed in the cam barrel 51, respectively, and the other rollers 63 and 65 fit into the groove 5 of the zoom barrel 47 in the direction of the optical axis 3.
It's stuck inside 0. The zoom barrel 47 is the gear 4
When B is driven by external rotational force, the groove 5
Since the intersection of the cam grooves 66 and 67 with respect to 0 changes,
Corresponding to the change in the intersection, the position of the guide shaft 60°61 is displaced in the direction of the optical axis 3. Along with this, variable magnification lens 5
8 moves in the front-back direction along the optical axis 3, and correspondingly, the correction lens 59 is displaced by the amount of movement necessary for correction. As a result, the magnification of the scanning light guided to the image sensor 10 changes while remaining in focus.

In all of the above embodiments, the eccentric pins 23.27.32 are integrally provided with the adjusting shafts 22, 26.31, and these are inserted into the holes 21.31.
25.30, and these adjustment shafts 22, 26.31 and eccentric pins 23.27.
32 may be configured as a dedicated driver-like jig and removed after adjustment.
) JJI @・1L′1・2゛・30. 11 and serves to expose the grooves 24, 28, and 33.

The adjusted positional relationship can be fixed by pressing the tips of the setscrews 34, 35° 36 against the outer periphery of the corresponding sensor holding tube 5 or lens tube 6.

Of course, adhesive or the like may be used for fixing after adjustment. Furthermore, if the plate 9 is used to fix the image sensor 10, it is advantageous for mounting the circuit board 16.
0 may be directly applied to the position of the contact surface 7 of the sensor holding cylinder 5 without using the plate 9. Although this optical device 1 was developed on the assumption that it would be used as an optical system in a facsimile, it can also be used not only in this but also in, for example, electronic copying machines.

In the present invention, a sensor holding tube is supported movably in the direction of the optical axis and in the circumferential direction within the cylindrical portion of the fixed support block, and a lens tube is movable in the direction of the optical axis inside the sensor holding tube. Since it is held in the state, azimuth,
Magnification and focus can be easily adjusted almost independently, and the slit at the rear end of the sensor holding cylinder always maintains an orthogonal relationship with the image sensor aligned with the optical axis. Since the surface angle of the support block can be adjusted without the need for adjustment, and the grooves in the circumferential direction or optical axis direction for position adjustment are exposed to the outside from the hole, adjustment work can be easily performed from the outside. Since the sensor holding tube and lens tube are assembled concentrically with each other stacked on top of each other, each part is well-organized, making assembly easier.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a single-lens optical device seen from the front.
Figures 2 and 3 are cross-sectional views taken along lines ■-■ and The sectional views, FIGS. 6 to 8, are VI of FIG. 5, respectively.
-VI line, ■-■ line, and ■-■ line are cross-sectional views. 1... Optical device, 2... Support block, 3...
・Optical axis, 4... Cylinder part, 5... Sensor holding tube, 6... Lens tube, 7... Contact surface,
8...Slit, 9...Plate, 10...
Image sensor, 21...hole, 22...adjustment axis,
23... Eccentric pin for azimuth adjustment, 24.
... Groove, 25 ... Hole, 26 ... Adjustment shaft, 27
... Eccentric pin for magnification adjustment, 28 ... Groove, 29
... Escape hole, 30 ... Hole, 31 ... Adjustment shaft, 32 ... Eccentric pin for focus adjustment, 33 ... Groove, 34 ... Set screw, 44 ... Lens, 47
...Zoom tube, 51...Cam tube, 58...
- Variable magnification lens, 59...correction t/lens.

Claims (1)

[Claims] A sensor holding cylinder is rotatably and slidably supported within the cylindrical portion of the support block, a lens cylinder is slidably supported within the sensor holding cylinder, and a slit is integrally provided on the end face of the sensor holding cylinder, and A linear image sensor is pressed and fixed on the outside of this slit, and the lens is supported within the lens barrel. Each groove is formed in the direction of the optical axis, and a hole is provided in the outer cylinder of the list to expose the cross section of the groove in the width direction, and the azimuth, magnification, and focus can be adjusted by displacing the position of the groove within each hole. An optical device for facsimiles, etc.