JPH09244156A - Moving optical system supporting device, original illuminator, copying device and original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a moving optical system supporting device to be stably slid on a guide rail without causing vibration and noise in the case of reciprocating a moving optical system by providing a balance weight attached to the moving optical system and capable of freely adjusting the position of the center of gravity in the reciprocating direction of the moving optical system and changing the position of the balance weight, thereby adjusting the position of the center of gravity in the reciprocating direction. SOLUTION: In the case the vibration and the noise are caused with respect to the moving optical system 16 at the time of exposing and scanning an original, the position of the center of gravity G is adjusted by changing the position of the balance weight 21. Concretely, the balance weight 21 is made to slide forward or backward in a moving direction and positionally adjusted, and a step screw 23 is tightened. Namely, when the position of the center of gravity G of the optical system 16 is on the line L of a sliding supporting part 18a supported at the point as the result of the adjustment of the balance weight 21, bending force does not act on the supporting part 18a and the supporting part 18a stably slides on the guide rail 17a when the optical system 16 travels.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving optical system supporting device, a document illuminating device, a copying device and a document reading device.

[0002]

2. Description of the Related Art Conventionally, as a method of reciprocating a moving optical system equipped with an original exposure lamp, a mirror, etc., in order to secure traveling stability, one side is slidably attached to a guide shaft and this guide shaft. A sliding bearing system using a fitted sliding portion has been generally used. However, including the mating structure,
Since assembly and the like are troublesome, in recent years, a simple sliding support method of simply placing it on a guide rail has become mainstream.

FIG. 4 is a schematic plan view showing a conventional example of a sliding support system. Reference numeral 1 denotes a moving optical system equipped with a document exposure lamp, a first mirror, etc., which is integrally mounted on a base plate 2 elongated in the left and right directions. The moving optical system 1 exposes and scans the surface of a document placed on a contact glass (not shown) in the sub-scanning direction. A pair of guide rails 3a and 3b are provided on the left and right along the reciprocating direction. It is arranged. Corresponding to such guide rails 3a and 3b, the guide rails 3a and 3b are provided on the lower surface near the left and right ends of the base plate 2.
Sliding support portions 4a and 4b that slide on the top are integrally formed to project. Here, the illustrated example is a three-point support, and the sliding support portion 4b side has _two , 4b ₁ and 4b ₂ . Also,
The lower ends of these sliding support portions 4a, 4b ₁ and 4b ₂ are hemispherical in order to improve the slidability. Further, a pair of wires 5a and 5b are stretched along the guide rails 3a and 3b, and some of these wires 5a and 5b are connected to the connecting portion 6.
It is fixedly connected to the left and right sides of the base plate 2 by a and 6b. The wires 5a and 5b constitute a wire drive system by being connected to a motor pulley or the like via a pulley or the like (not shown). By operating the wires 5a and 5b uniformly as a double-sided wire drive system, the directionality of the moving direction of the moving optical system 1 Are configured to be secured.

[0004]

However, in the case of this type of simple sliding support system, the guide rail 3 is basically used.
The moving optical system 1 is designed so that the moving optical system 1 (base plate 2) is simply placed on the a and 3b so that the moving optical system 1 is weight-balanced. The weight balance may be lost due to other factors. For example, as shown in FIG. 4, when the center of gravity G in the moving direction of the moving optical system 1 is not on the line L of the slide supporting portion 4a, the slide supporting portion 4a is contacted with the guide rail 3a. A bending force F around the center is applied. FIG.
FIG. 6 is a side view showing a state in which a bending force F acts due to a shift of the center of gravity position G.

That is, the sliding support portion 4a is the guide rail 3a.
Therefore, the sliding motion becomes unstable. As a result, the reciprocating movement of the moving optical system 1 causes vibrations, impairing reading performance, and noise.

In view of the above, the present invention provides a moving optical system supporting device capable of smoothly sliding on a guide rail while preventing vibration and noise in a simple sliding supporting system using a double-sided wire driving system, and this moving optical system supporting device. It is an object of the present invention to provide a document illuminating device using the same, or a copying apparatus and a document reading device using the document illuminating device.

[0007]

According to a first aspect of the present invention, there is provided a moving optical system supporting device comprising a pair of wire driving systems connected to both sides of the moving optical system to reciprocate the moving optical system; A pair of left and right guide rails arranged along the direction of reciprocal movement; three or more sliding support portions integrally formed on both sides of the moving optical system and sliding on the guide rails; attached to the moving optical system Balance weights capable of adjusting the position of the center of gravity of the moving optical system in the reciprocating direction. The shape of the balance weight is not particularly limited,
A thin plate-like member is preferable so as not to impair the traveling property of the moving optical system. The location of the balance weight is also not particularly limited, but as in the second aspect of the invention, it may be disposed in the center of the moving optical system in the left-right direction and attached so as to be adjustable only in the reciprocating direction. desirable. Also,
The sliding support portion is allowed to be a four-point support with two left and right points, but a three-point support system having the largest design tolerance is preferable. In the invention according to claim 3, the sliding support portion is a three-point support system in which one is one point and the other is two points, and the balance weight has only one center of gravity position in the reciprocating direction of the moving optical system. The structure is adjusted so that it is on the line of the sliding support part.

Therefore, according to such a moving optical system supporting device, the position of the balance weight is changed to adjust the position of the center of gravity of the moving optical system in the reciprocating direction, so that the sliding supporting portion slides on the guide rail. It is possible to obtain a balanced state in which no bending force acts on, and no vibration or noise is generated when the moving optical system reciprocates,
Stablely slide on the guide rail.

According to a fourth aspect of the present invention, there is provided a document illuminating device including a movable optical system having at least a document exposure lamp; and a movable optical system supporting device according to any one of the first to third aspects;
It has. Therefore, since the moving optical system supporting device according to any one of claims 1 to 3 is provided, the original can be stably exposed and scanned without vibration or noise.

According to a fifth aspect of the present invention, there is provided a copying apparatus including the document illuminating device according to the fourth aspect and a photoconductor on which image light of a document image is exposed by a moving optical system. Therefore, since the document illuminating device according to the fourth aspect is provided, it is possible to satisfactorily perform image formation based on stable exposure scanning of the document.

An original reading apparatus according to a sixth aspect of the present invention includes the original illuminating apparatus according to the fourth aspect; and an image sensor for forming and exposing the original image light by a moving optical system. Therefore, since the document illuminating device according to the fourth aspect is provided, it is possible to satisfactorily read the document based on stable exposure scanning. The document reading device may be an image scanner alone, or may be a facsimile reading device or a digital copying machine reading device.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The moving optical system supporting device of the present embodiment is applied to, for example, a document illuminating device in a copying machine. 1 is a schematic plan view showing a sliding support system, FIG. 2 is a schematic vertical sectional side view showing a structure of a moving optical system,
FIG. 3 is a schematic front view showing the sliding support system.

First, a document exposure lamp 13 for exposing and illuminating a document 12 placed on the contact glass 11 in the sub-scanning direction, and a first mirror for guiding the reflected light from the document 12 to the photoconductor (not shown) side. A moving optical system 16 in which 14 and 14 are mounted on the left and right on a slender base plate 15 is provided. In the main body of the apparatus, a pair of guide rails 17a and 17b are arranged parallel to each other along the reciprocating direction of the moving optical system 16. Corresponding to such guide rails 17a and 17b, a slide support portion 18 that slides on the guide rails 17a and 17b is provided on the lower surface near the left and right ends of the base plate 15.
a and 18b are integrally formed to project. In the present embodiment, a three-point support system is used, and the sliding support portion 18a side is 1
There are two points, 18b ₁ and 18b ₂ on the sliding support portion 18b side. In addition, these sliding support portions 18a, 18b
The lower ends of ₁ , 18b ₂ are hemispherical in order to improve slidability. Further, a pair of wires 19a and 19b are stretched along the guide rails 17a and 17b, and some of the wires 19a and 19b are connected and fixed to the left and right sides of the base plate 15 by connecting portions 20a and 20b. . The wires 19a and 19b constitute a wire drive system by being connected to a motor pulley or the like via a pulley or the like (not shown). Are configured to be secured.

Further, a balance weight 21 is attached to the lower surface of the base plate 15. The balance weight 21 has a rectangular plate shape, and has a pair of left and right elongated holes 22a and 22b along the moving direction of the moving optical system 16, and the stepped screw 2 is provided through these elongated holes 22a and 22b.
It is attached to the lower surface of the base plate 15 by means of 3 or the like.
Therefore, by loosening the stepped screw 23, the position of the balance weight 21 can be adjusted only in the reciprocating direction of the moving optical system 16. Further, such a balance weight 21 is set so as to be always positioned in the center position in which the weight is balanced in the left-right direction of the moving optical system 16.

Next, the operation will be described. By simultaneously driving the wires 19a and 19b via a motor pulley or the like, the moving optical system 16 is also pulled by the wires 19a and 19b so that the sliding support portions 18a, 18b ₁ and 18b ₂ slide on the guide rails 17a and 17b. The original 12 is exposed by the original exposure lamp 13 by moving in the sub-scanning direction. Manuscript 1
The reflected light from 2 passes through the first mirror 14, and then is imaged on the photoconductor through the second and third mirrors (not shown), the imaging lens (not shown) and the like.

The moving optical system 1 during the exposure scanning of the original document
With respect to 6, when vibration or noise occurs, the position of the balance weight 21 is displaced to adjust the position G of the center of gravity. Specifically, the stepped screw 23 is temporarily loosened, the balance weight 21 is slid forward or backward along the moving direction, the position is adjusted, and the stepped screw 23 is tightened. Then, after the adjustment, the moving optical system 16 is actually test run, and if no vibration or noise is generated, the adjustment is completed. That is, by adjusting the balance weight 21, as a result,
As shown in FIG. 1, if the center of gravity G of the moving optical system 16 is on the line L of the sliding support portion 18a that supports one point, the moving optical system 16 bends to the sliding support portion 18a during traveling. This is because no force acts and the slide support portion 18a slides on the guide rail 17a in a stable manner. By the way, it is possible to uniformly specify the confirmation method of the adjustment result of the center of gravity position G by the balance weight 21, but in reality, there are factors such as variations among individual products and changes over time. It is difficult to specify, and the method of confirming that vibration and noise are not generated by trial and error including trial run is suitable for the actual situation.

[0017]

According to the inventions of claims 1 to 3,
Since the balance weight is attached to the moving optical system and the position of the center of gravity of the moving optical system can be adjusted in the reciprocating direction, the position of the balance weight can be changed to adjust the position of the center of gravity in the reciprocating direction of the moving optical system. Just by doing so, it is possible to obtain a balanced state in which bending force does not act on the sliding support part that slides on the guide rail, and it does not generate vibration or noise during the reciprocating movement of the moving optical system and slides stably on the guide rail. Can be made.

According to the invention described in claim 4, since the moving optical system supporting device according to any one of claims 1 to 3 is provided, the original is stably exposed and scanned without vibration or noise. It is possible to provide a document illuminating device that operates.

According to the fifth aspect of the present invention, since the original illuminating device according to the fourth aspect is provided, it is possible to provide a copying apparatus capable of favorably forming an image based on stable exposure scanning of the original.

According to the sixth aspect of the invention, since the document illuminating device according to the fourth aspect is provided, it is possible to provide a document reading device capable of satisfactorily reading a document based on stable exposure scanning.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing a sliding support system according to an embodiment of the present invention.

FIG. 2 is a schematic vertical sectional side view showing the structure of a moving optical system.

FIG. 3 is a schematic front view showing a sliding support system.

FIG. 4 is a schematic plan view showing a conventional example of a sliding support system.

FIG. 5 is a side view showing a state in which a bending force F acts due to a shift of the center of gravity position G.

[Explanation of symbols]

Reference numeral 13 Document exposure lamp 16 Moving optical system 17a, 17b Guide rails 18a, 18b ₁ , 18b ₂ Sliding support portions 19a, 19b Wire drive system 21 Balance weight

Claims (6)

[Claims] 1. A pair of wire driving systems connected to both sides of a moving optical system to reciprocate the moving optical system; a pair of left and right guide rails arranged along a reciprocating direction of the moving optical system; Three or more sliding support portions that are integrally formed on both sides of the optical system and slide on the guide rails; balance weights that are attached to the moving optical system and that can adjust the position of the center of gravity of the moving optical system in the reciprocating direction; A moving optical system supporting device comprising: 2. The moving optical system supporting device according to claim 1, wherein the balance weight is arranged at a central portion of the moving optical system and is attached so as to be adjustable only in a reciprocating direction. 3. The slide support has three points, one point on one side and two points on the other side; the balance weight is on the line of the slide support section having only one center of gravity in the reciprocating direction of the moving optical system. Adjusted to be
Alternatively, the moving optical system supporting device according to the item 2. 4. A document illuminating device comprising: a moving optical system having at least a document exposure lamp; and a moving optical system supporting device according to claim 1. 5. A copying apparatus, comprising: the original illuminating device according to claim 4; and a photoconductor on which image light of an original image is imagewise exposed by a moving optical system. 6. A document reading device comprising: the document illuminating device according to claim 4; and an image sensor for forming and exposing document image light by a moving optical system.