JP2880768B2 - Lens carriage - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lens carriage for holding an image reading lens such as a scanner.

2. Description of the Related Art It is known that an image reading lens incorporated in, for example, a copying machine or the like is held by a lens carriage.

Conventionally, this type of image reading lens is mounted on an aluminum cylindrical lens frame, and this lens frame is mounted on a lens carriage.

When such a lens carriage is mounted on a copying machine main body, the mounting position of the carriage and the eccentricity of the lens are adjusted in order to correct the tilt of the image forming surface of the image reading lens. Specifically, first, before mounting the lens on the carriage, the carriage is mounted on the main body, a dummy lens frame with a mirror is inserted into the lens mounting portion of the carriage, and laser light is emitted from the lens optical axis direction. The reflected light is read by a mirror, and the inclination of the carriage is adjusted. Next, after performing the tilt adjustment, the lens frame incorporating the lens is inserted into the carriage lens mounting portion, and the eccentricity of the lens is adjusted while rotating the lens frame.

[Problems to be Solved by the Invention] However, since the conventional lens carriage requires a lens frame for mounting a lens, there is a problem that the number of parts and the number of assembling steps increase, and the manufacturing cost increases. Further, in the related art, it is necessary to adjust the inclination in a direction parallel to the image plane direction of the carriage main body before adjusting the eccentricity of the lens, and thus there is a problem that the adjustment operation is troublesome.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to directly mount a lens on a lens carriage, omit a conventional lens frame, reduce manufacturing cost, and simplify eccentricity adjustment of the lens.

[Means for Solving the Problems] For the purpose described above, the means adopted by the present invention is that the image reading lens is directly mounted on a carriage main body, and the carriage main body is provided separately from the carriage main body. The carriage is fixed to a slide portion with the guide bar, and the inclination of the carriage body with respect to the lens optical axis can be finely adjusted at the fixed portion.

Further, the carriage main body is fixed to the sliding portion with a screw, and the inclination of the carriage main body with respect to the lens optical axis can be adjusted within a range of a screw hole into which the screw is inserted.

Further, a jig insertion hole for positioning the lens portion on the optical axis is provided in the lens mounting portion of the carriage body.

Further, the image reading lens is supported by a lens insertion port provided in the carriage body, and is held by a holding ring.

[Operation] Since the lens is directly attached to the carriage body, a lens frame is not required. Further, the eccentricity adjustment of the lens with respect to the optical axis finely adjusts the inclination of the carriage main body with respect to the lens optical axis at the fixing portion when the carriage main body is fixed to the sliding portion with the guide bar.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a schematic view of a mirror zoom type copying machine to which the present invention is applied.

In this zooming method, the lens 51 is moved, and the mirror 52 and
This method adjusts the distance from the lens 53 to perform magnification conversion from reduction to enlargement, irradiates the original placed on the table glass 50 with illumination light, and reflects the reflected light on the image reading lens 51 and the mirror 5.
Exposure to photosensitive drum 55 via 2, 53 and mirror 54,
In this method, an electrostatic latent image is formed on a drum, and toner is adhered to the drum to be fixed on a developing paper.

FIG. 1 is a plan view of a lens carriage of the image reading lens, and FIG. 2 is a front view thereof.
Is a carriage main body, and 2 is a sliding portion separate from the carriage main body.

A lens insertion port 3 is formed at the end of the carriage body 1, and a convex lens 4, a concave lens 5, and a convex lens 6 constituting a reading lens group are sequentially inserted into the lens insertion port 3.

As shown in FIG. 3, the convex lens 4 is locked by a step 7 formed on the inner periphery of the lens insertion port 3, and the concave lens 5
Is disposed above the convex lens 4 via an annular spacer 8 made of aluminum. The spacer 8 is for holding the convex lens 4 and the concave lens 5 at a predetermined interval. The convex lens 6 is disposed above the concave lens 5, and the concave lens 5
Is in contact with the convex lens 6 at its outer peripheral end.

Reference numeral 9 denotes a press ring, as shown in FIG. 4, which has a plurality of screw holes 11 formed in a circumferential direction and a plurality of projecting pieces 10 formed in an inner peripheral portion. The holding ring 9 is screwed to a step 12 formed on the inner surface of the lens insertion opening 3.
As a result, the protruding piece 10 comes into contact with the peripheral end of the curved surface of the convex lens 6, and the protruding piece 10 presses the convex lens 6, the concave lens 5, the spacer 8, and the convex lens 4 downward.

On the other hand, the sliding portion 2 has a traveling portion 20 having an insertion opening 21 for a guide bar (not shown), and a bracket 22 for supporting the carriage body 1. The traveling section 20 has a pivot 23, and a shaft hole formed at an end of the carriage body 1 is inserted therein.

The sliding portion 2 and the carriage main body 1 are connected at a plurality of positions, for example, at the running portion 20 and the bracket 22 with screws 24a, 24b, 24c.
Fixed by In this case, the screw holes 25a, 25b, and 25c formed in the carriage main body 1 are elongated holes, so that the carriage main body 1 can be slightly rotated around the pivot shaft 23.

In addition, in the drawing, reference numeral 30 denotes a bracket for mounting a photo sensor for detecting the movement amount of the lens carriage,
31 is a wire locking portion for moving the lens carriage, 32
Numeral denotes an insertion hole of a jig for adjusting the optical axis after the lenses 4, 5, and 6 are assembled in the carriage body 1.

Next, an example of use of the present invention will be described. First, as described above, lenses 4, 5,
After the carriage 6 is inserted and fixed by the holding ring 9, the carriage body 1 is fixed to the sliding portion 2 held by the guide rail. In this case, before tightening the screws 24a, 24b and 24c, while looking at the state of the projected image,
The carriage body 1 is rotated in the vertical direction toward FIG. 1 around the center of FIG. 1, and the lens group is slightly inclined with respect to the lens optical axis 40 to adjust the defocus of each image height due to the eccentricity of the lens.

In particular, in a copying machine or the like, since an image is read in a line, the eccentricity of the lens can be adjusted by searching for a predetermined line whose focus matches at each image height on the line. For that purpose, only the inclination adjustment of the carriage body 1 is sufficient. Becomes

FIG. 6 is a plan view showing another embodiment of the present invention, and FIG. 7 is a front view thereof.

In the drawing, 1 is a carriage body, 20 is a traveling portion that slides on a guide bar 41, 22 is a bracket provided on the traveling portion 20,
Reference numerals 4, 5, and 6 denote image reading lens groups supported by the lens insertion opening 3, and their configurations are basically the same as those in the embodiment of FIG. The carriage body 1 is fixed to the traveling section 20 and the bracket 22 by screws 42, 43, 44.
The 2,43,44 screw holes are formed slightly larger in diameter than the screw outer diameter, and the fine adjustment of the carriage body is possible with the screws loosened. In this embodiment, the positioning jig insertion hole 45 is provided at the optical axis center position of the peripheral wall constituting the lens insertion port 3.
Is open.

In the case of this embodiment, first, a pin-shaped jig is arranged on the lens optical axis, and the carriage body 1 is attached to the jig.
The positioning jig insertion hole 45 (to which the lenses 4, 5, and 6 are attached in advance) is inserted, and the sliding portion 2 side of the main body 1 is lightly stopped with the screws 42, 43, and 44. Next, the sliding portion 2 of the carriage body 1 is moved up and down around the insertion hole 45 toward FIG. 6 to adjust the eccentricity of the lens, and then the screws 42, 43 and 44 are tightened. is there.

The above-described embodiment is an example of the present invention, and the configuration of the lens, the configuration of the lens carriage main body, and the like are not limited to those illustrated. Further, in the embodiments, the description has been given by taking the variable power lens of the copying machine as an example, but the present invention can be applied to any apparatus having an image reading lens.

[Effects of the Invention] According to the present invention described above, the image reading lens provided on the lens carriage is directly mounted on the lens carriage main body. The man-hour is omitted, and the manufacturing cost is reduced. Further, the adjustment of the inclination of the reading lens mounted on the lens carriage main body with respect to the optical axis can be easily performed only by finely adjusting the mounting state of the carriage main body in the fixed portion with the guide bar sliding portion.

[Brief description of the drawings]

FIG. 1 is a plan view of a lens carriage according to the present invention, and FIG.
FIG. 3 is a front view, FIG. 3 is a schematic view showing an assembled state of the image reading lens of the present invention, FIG. 4 is a plan view of a lens holding ring, and FIG. FIG. 6 is a schematic view of a zoom system, FIG. 6 is a plan view showing another embodiment of the present invention, and FIG. 7 is a front view of the same. 1 ... carriage main body, 2 ... sliding part, 3 ... lens insertion port, 4, 5, 6 ... image reading lens, 23 ... pivot, 24a
~ 24c …… Carriage body mounting screw, 25a ～ 25c…
… Long holes, 42, 43, 44… Carriage body mounting screws, 45
…… Positioning jig insertion hole

Claims (4)

(57) [Claims] 1. A lens carriage for supporting an image reading lens, wherein the image reading lens is directly mounted on a carriage body, and the carriage body slides on a guide bar provided separately from the carriage body. A lens carriage, wherein the inclination of the carriage body with respect to the lens optical axis can be finely adjusted in the fixing section. 2. The apparatus according to claim 1, wherein the carriage main body is fixed to the sliding portion with a screw, and the inclination of the carriage main body with respect to the lens optical axis can be adjusted within a screw hole into which the screw is inserted. The lens carriage according to claim 1. 3. The lens carriage according to claim 1, wherein a jig insertion hole for positioning the lens portion on the optical axis is provided in the lens mounting portion of the carriage body. 4. The lens carriage according to claim 1, wherein the image reading lens is supported by a lens insertion port provided in the carriage body, and is held by a holding ring.