JPS61177446A - Plane scanning type optical device - Google Patents

Abstract

PURPOSE:To obtain the titled optical device whose mirror does not make any vibration and which is suitable for improving the speed and resolution, by using a formed product of a synthetic resin for its carriage and providing the mirror made of a synthetic resin at a desired position of the carriage in one body. CONSTITUTION:A formed product of a synthetic resin is used for a carriage. Therefore, the carriage can be formed easily in any desired shape. Moreover, mirrors are formed in one body with the carriage by applying or depositing a metallic reflecting film and providing a protective film on the carriage. Since the 1st-3rd mirrors are formed in one body with the carriage, the natural vibrations of the mirrors themselves caused by the vibrations at the time of high-speed running are not produced and, therefore, this optical device is suitable for improving the speed and resolution.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is used in flat scanning optical devices, particularly facsimile machines, copying machines, image scanners, etc., to detect reflected or transmitted light from the surface of a document illuminated by a light source. , relates to a plane scanning optical device that guides an image to an image recording medium via a mirror that moves parallel to the surface of the document.

[Conventional technology]

Conventionally, this type of device was disclosed in Japanese Patent Application Laid-Open No. 59-178442.
There is something described in the No. Figure 2 is a perspective view of the main parts of this device. In the figure, 1°2 is the shaft and angle as guide rails arranged in parallel at a constant interval, 3'3°, 4 is the ball. Shaft 1 is rotated by rotating and sliding mechanisms such as bearings, sliding bearings, and rollers.
A carriage (
movement mechanism).

5.6 is attached to the carriages 3 and 4, and converts the reflected light or transmitted light from the document surface illuminated by a light source (not shown) into an image recording medium (not shown) such as a photoreceptor or solid-state image sensor (COD). ), 7 is a motor as a driving source, 8 is a pulley that converts the rotational speed of the motor 7 to the required rotational speed, 9 is a timing belt suspended between the pulleys 8, 8,
A projecting piece 3a of the carriage 3 is fixed to a part thereof.

10.10 is Gooley-11 which is pivotally supported on carriages 3 and 4.
Reference numeral 1 denotes a belt suspended around pulleys 10 and 10, and has a shock-absorbing spring 12 and a mounting piece 13 for the timing belt 9 in the middle thereof.

Next, the operation will be explained. By rotating the drive motor 7 at a required number of rotations, the carriage 3 coupled to the timing belt 9 can be moved along the shaft 1 and the angle 2 at a required speed. At this time, the other carriage 4 also connects the carriage 3 via the belt 10.
move in the same direction.

On the other hand, the reflected light from the document surface is reflected by the mirror 7'-6, which is a glass plate coated with a metal reflective film, and is guided to the image recording medium via the mirror 5 attached to the carriage 4 at an angle parallel to this mirror. It will be destroyed. Therefore, image information can be obtained by moving the fluorescent lamp and each mirror parallel to the stationary document surface.

[Problems to be Solved by the Invention] Since the conventional plane scanning optical device is constructed as described above, it is necessary to keep the two carriages parallel and attach mirrors to each parallel and at a required angle. Adjustments are required. Furthermore, since the mirror and carriage are formed separately, there are many problems such as high cost and the mirror itself vibrating as the carriage scans, resulting in distorted images.

This invention was made to solve the above-mentioned problems; it does not require mirror adjustment, and is inexpensive.
The object of the present invention is to obtain a plane scanning optical device with less vibration of the mirror itself.

[Means for solving problems]

In the plane scanning optical device according to the present invention, parallel carriages are molded from synthetic resin, and mirrors made from synthetic resin are integrally provided at required positions on the carriage.

[For production]

By making the carriage in this invention a synthetic resin molded product, any shape can be easily realized and it can be made lightweight. Further, the mirror can be easily formed by coating or vapor depositing a metal reflective film on the carriage and providing a protective film.

[Metal practice]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 21.22 is a steel round bar shaft as a guide rail arranged in parallel, 23.24 is provided with circular holes 30, 31 through which the shaft 21.22 passes, and the shafts 21 and 22 in the circular hole are provided. This is a carriage (moving mechanism) made of polycarbonate by injection molding, and a ball bearing (not shown) is disposed in the contact area with the carriage.

A first mirror 25 is integrally formed on the carriage 23. A first mirror 25 is coated with a metal reflective film by low-temperature vapor deposition and its surface is covered with a transparent protective film.

Similarly, the first mirror 2 is mounted on the carriage 24.
2nd and 3rd mirrors 26&, 26b which double reflect the reflected light a from 5 are formed by vapor deposition. 27 is a pulse motor, 28 and 28 are pulleys, and 29 is a belt suspended around the pulleys 28 and 28, to which the projecting piece 23a of the carriage 23 is attached. 32 is a pulley provided at the end of the motor shaft 33;
The projecting piece 24a of the carriage 24 is attached to the belt 34 suspended from the
is installed.

In one embodiment of the present invention configured in this manner, the carriage is driven by a pulley 28 having a required number of teeth attached to the shaft 33 of a pulse motor 27 that rotates at a required number of rotations, and a timing belt 29 suspended around the pulley. 23 (shirt)) 21
, 22. -10,000, the carriage 24 is
Boo'J-32, provided on the opposite side of the motor shaft 33, is similarly moved (by the belt 34).

Note that the reflected light from the surface of the document illuminated by the fluorescent lamp is the first.
Second. It is guided to the image recording medium via the third mirrors 25.2aa and 26b and through an imaging lens (not shown).
In order to keep the optical path length constant, for example, the diameter of the pulley 28 is made twice the diameter of the pulley 32, so that the scanning speed of the carriage 23 is twice that of the carriage 24.

Recently, it has become possible to read solid-state image sensors at high speeds, and high-intensity fluorescent lamps are easily available, so high-speed document reading has become an essential condition. It has become possible to read an A4 size original S with 11110 resolution using a solid-state image pickup device and a signal processing circuit, and a plane scanning optical device compatible with these is required.

However, in the plane scanning optical device of the present invention, the first to
Since the third mirror is integrated with the carriage, natural vibrations of the mirror itself do not occur due to vibrations during high-speed running, and the second mirror is integrated with the carriage. Thirdly, it can be regarded as a single mirror in terms of vibration shadowing, and has a structure suitable for high speed and high resolution.

In the above embodiments, polycarbonate was used as the synthetic resin, but other moldable resins such as ABS, polypropylene, vinyl chloride, etc. may be used. Furthermore, it goes without saying that the modification treatment facilitates molding.

Furthermore, to increase the strength of the carriage, carbon fiber,
This can be achieved by using reinforced resin mixed with reinforcing materials such as carbon powder and aramid fiber. One way to form a mirror is to apply a metal reflective film.

Vapor deposition and other methods can be employed.

〔Effect of the invention〕

As described above, according to the present invention, the parallel carriage that moves on a plane is made of a synthetic resin molded product, and the synthetic resin mirror is integrally provided at the required position of this carriage, so that the vibration of the mirror itself is reduced. This has the advantage that a plane scanning optical device that does not require a mirror adjustment and is suitable for high speed and high resolution can be easily obtained with high accuracy at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a plane scanning optical device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional plane scanning optical device. 23.24 is a carriage, 25.26m, 26b is a mirror.

Claims (2)

[Claims] (1) In a plane scanning optical device that guides reflected light or transmitted light from a document surface illuminated by a light source to an image recording medium through a mirror provided on a plane scanning carriage,
An optical device for a plane scanning type, characterized in that the carriage is a molded article made of synthetic resin, and a mirror made of synthetic resin is integrally provided on the carriage. (2) The optical device for a plane scanning type according to claim (1), wherein the synthetic resin mirror comprises a metal reflective film and a protective film.