JPS6019704B2 - Manuscript succession device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manuscript discussion device used, for example, in facsimile machines.

Conventionally, there are various methods for reading a thick original such as a book, such as an original moving method, a solid-state image sensor moving method, and a mirror scanning method.

Of these, the original moving method and the solid-state image sensor moving method have limits in their moving speed, and are unsuitable for high-speed discussions. Furthermore, although the mirror scanning method is good in terms of high speed, it has the disadvantage that there is variation in the scanning speed of the mirror, which reduces the quality of the read image. The present invention has been made in view of the above points, and uses a mirror scanning method to eliminate variations in the scanning speed of the mirror,
It is an object of the present invention to provide a manuscript collection device capable of high-speed and high-quality manuscript collection.

The present invention provides a device in which a document and a solid-state image sensor are fixedly provided, and an image of the document is caused to be scanned by the solid-state image sensor using an optical system having a movable mirror connected to a drive section. A linear encoder is provided on the side of the document, and a photodetector is arranged on the image forming surface of the linear encoder to control the operating speed of the driving section by capturing the image formed by the linear encoder. It is something to do.

Therefore, the angular velocity of the movable mirror that changes the tilt angle is determined by the drive unit, but the optical image of the linear encoder is also read by the photodetector along with the original image, and this controls the operating speed of the drive unit, so the scanning speed is adjusted. It is structured so that it can be maintained at a constant level and that high-quality courses can be carried out. Embodiments of the present invention will be described based on the drawings.

First, a manuscript tray 1 is fixedly provided using a translucent contact glass or the like, and a manuscript 2 such as a book is placed on the upper surface of the manuscript tray 1 with its image facing downward. There is. Furthermore, a cylindrical reflecting plate 3 that opens toward the center is provided at both ends of the lower part of the source bridge calendar stand 1,
Lamps 4 are mounted inside these reflectors 3.
Further, a reflective IJ near encoder 5 is provided on the side edge of the document stacking table 1 on the sub-scanning side. Then,
A planar movable mirror 6 is provided at the lower part of the document stacking table 1, and a shaft 7 formed at the center of the movable mirror 6 is connected to a motor 8 serving as a driving section.

Further, an imaging lens 10 is provided, which forms an optical system 9 together with the lamp 4 and the movable mirror 6. A solid-state image sensor 11 is provided with a length that can cover the area. A photodiode 12 serving as a photodetector is installed on the side of the solid-state image sensor 11, that is, on the imaging plane of the linear encoder 5. The solid-state image sensor 11 is connected to a plotter section 13 that employs any of the well-known laser printing methods, OFT methods, stylus methods, etc., and the photodiode 12 is connected to a control section connected to the motor 8. A circuit 14 follows. Note that reference numeral 15 is a document image of the document 2, and reference numeral 16 is a linear encoder image of the linear encoder 5.

In such a configuration, the movable mirror 6 is rotated by driving the motor 8, and the document image 1 is thereby rotated.
5 moves on a solid-state image sensor 11 that is fixedly provided.

Then, the document image 15 is scanned in the sub-scanning direction by the movable mirror 6, and an image signal is extracted and sent to the plotter section 13. In addition, on the other hand, the original image image 1
6 is also scanned onto the photodiode 12, so that
The angle of the movable mirror 6 is checked one by one. The signal from the photodiode 12 is fed back to the motor 8 via the control circuit 14, and the rotation of the motor 8 is controlled so that the angular velocity of the movable mirror 6 is constant. In the present invention, a document and a solid-state image sensor are fixedly provided as described above, and the document image is scanned by a movable mirror, and a linear encoder is provided on the side of the document. A photodetector is provided to detect the image, and the operating speed of the movable mirror drive unit is controlled by this detection signal, so variations in the angular velocity of the movable mirror can be eliminated and a constant scanning speed can be obtained at all times.
This makes it possible to obtain high-quality original image signals even when high-speed discussion is performed.

[Brief explanation of the drawing]

The drawing is a perspective view showing an embodiment of the invention. 2...Manuscript, 5...Linear encoder, 6
......Movable mirror, 8...Motor (drive unit), 9...Optical system, 11...Solid image sensor, 12...・Photodiode (photodetector).

Claims (1)

[Claims] 1. A document in which a document and a solid-state image sensor are fixedly provided, and the document image of the document is scanned by the solid-state image sensor using an optical system interposed with a movable mirror connected to a drive unit, in which the document image of the document is scanned by the solid-state image sensor. A document reading device characterized in that a linear encoder is provided on the side, and a photodetector is disposed on the image forming surface of the linear encoder for controlling the operating speed of the driving section by reading the image formed by the linear encoder.