JPS63151175A - Picture reader - Google Patents

Abstract

PURPOSE:To read one picture of two kinds of originals and to read both the originals, being synthesized, through the use of one number of a device by using one of the first optical system and the second optical system or both the systems selectively. CONSTITUTION:When a synthesized picture reading is selected, a switching mirror 20 rotates to a position 20A regarding an axis Z-Z as a supporting point, and the synthesized frame picture of f1 and f2 is imaged f' on the light receiving range area surface 19 of an image sensor 18 through a halfmirror 15, and is read by the sensor 18. Next, when an f1 picture reading is selected, a shutter S2 rotates to the position to interrupt the optical path of a imaging lens 13 and simultaneously the switching mirror 20 rotates to the position 20A regarding the axis Z-Z as a center, and only the frame picture of f1 is imaged on the light receiving range area surface 19, and is read and processed. Next, an f2 picture reading is selected, the shutter S1 rotates to the position to interrupt the optical path of the imaging lens 12, and simultaneously, the switching mirror 20 rotates to the position 20A, and only the frame picture of f2 is imaged, read and processed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image reading device that forms an image on an image sensor and reads the image.

[Prior Art] This type of image reading device is known as, for example, a device for reading frame images of microfilm.

FIG. 4 shows a schematic configuration of one using a one-dimensional array image sensor as an example.

In the figure, F stands for microfilm (roll film).
f is the individual frame image shot and recorded on the film, l is the lamp for illuminating the film frames, 2 is the condenser lens,
3 is an imaging lens that forms the frame image f on the light-receiving area surface of the image sensor, L is its optical axis, and 4 is an X-X direction as the main scanning direction, and a Y-Y direction perpendicular thereto as the sub-scanning direction. A one-dimensional array image sensor 5 is moved in the sub-scanning direction by a drive mechanism (not shown), and 5 is a light-receiving range area defined by the main-scanning length and the sub-scanning movement length of the image sensor 4.

When reading an image on a film, the frame f of the microfilm F to be read is set at the film frame illumination position. The film frame f at the illumination position 2 is illuminated by the illumination lamp 1, and the transmitted light of the four films, that is, the image of the film frame f, is formed into an image f' within the light-receiving area surface 5 of the image sensor 4 by the imaging lens 3. The formed image f' is divided into the electrical main scanning direction of the image sensor 4 in the X-X direction and the Y-
The reading process is performed sequentially from the top side to the bottom side by mechanical sub-scanning movement in the Y direction, and time-series electric pixel signals corresponding to the formed image are output from the image sensor 4.

The output signal is input to an image reproducing device, image display device, or recording device (not shown) such as a printer mechanism, facsimile receiving device, display device, etc., and an image corresponding to the read image is reproduced, displayed, stored, etc. Ru.

[Problem to be solved by the invention 1 By the way, Microfilm, which is an information recording medium, is available in roll form, sheet form (fish film, aperture card), and film width (16□, 3
5□) and differences in the shooting format of frame images (shooting reduction ratio,
Several types are used depending on the orientation of the image.

When attempting to read frame images of different types of microfilm from among these several types of microfilm using the image reading device, it is necessary to prepare an image reading device suitable for each type of microfilm, or It was necessary to replace the microfilm holding member of the reading device each time, and it was impossible to read frame images of two types of microfilm at the same time.

An object of the present invention is to provide an image reading device that solves the above problems.

[Means for Solving the Problems] The present invention provides an image reading device that forms an image on an image sensor and reads the formed image. and a second optical system for forming a second image on the image sensor, and either or both of the first optical system and the second optical system can be selectively used. do.

[Embodiment] FIG. 1 is a diagram showing an overview of an embodiment of the present invention, and FIG. 3 is a diagram showing an operation flow by the apparatus of the present invention.

The present invention will be explained below with reference to the drawings.

In Fig. 1, 6 is the first imaging optical system, 7 is the second imaging optical system, F is the aperture cart placed in the first imaging optical system, and fl is the recording record on the aperture cart F r. The frame image F2 is a fish film placed in the second imaging optical system, and f2 is a frame image photographed and recorded on the fish film F2.

8 and 9 are lamps for film illumination, 10-11 are condenser lenses, 12 is an imaging lens that forms the frame image f1 on the light-receiving range surface of the image sensor 18, and Ll is its front axis;
13 is the frame image f, mirror 14 and half mirror 1
5, an imaging lens that forms an image on the light receiving range surface of the image sensor 18, L2 is its optical axis, and 16 is a frame image f+
A transmissive monitor screen projects f*, and 17 is a monitor adapter lens.

18 is a one-dimensional array image sensor that is moved in the sub-scanning direction by a drive mechanism (not shown) with the X-X direction as the main scanning direction and the Y-Y direction perpendicular thereto as the sub-scanning direction; 19 is the sensor 1
This is a light receiving range area surface defined by a main scanning length and a sub-scanning movement length of 8. 20 is a frame image f1 projected through the half mirror 15. This is a switching mirror that projects f t onto the monitor screen 16, and when reading frame images, the axis Z-
It rotates around Z to a position of 2OA, and the frame image f,...
f2 is projected onto the light receiving range area surface 19.

Sl and S2 are rotatable shutters that block and open the optical paths of the imaging lenses 12 and 13, respectively.

Here, when each component is in the solid line position shown in the figure, the operator can send the frame images f, f2 of the desired microfilms F, F2 to the frame image illumination of the first imaging optical system and the second imaging optical system, respectively. When set in position (step 1), the frame images f r and f 2 illuminated by the lamps 8 and 9 become half mirrors.
15, a switching mirror 20, and an adapter lens 17, the images are combined and projected onto a monitor screen 16. (
Step 2) Next, the operator selects whether to read the composite image of f, , f, the image of only fr, or the image of only f2. This selection is made using the three image reading buttons shown in FIG.
3. Use the f2 image reading button 24. First, when the operator selects the composite image reading button 22 (step 3), the switching mirror 20 rotates to the position 20A about the axis Z-Z as a fulcrum (step 7).
A composite frame image of f is formed on the light-receiving range surface 19 of the image sensor 18 f'. Then, the imaged image f' is read by electrical main scanning movement of the sensor 18 in the X-x direction and mechanical sub-scanning movement in the Y-Y direction (step 8), and a time series of read signals from the sensor 18 is read. An electrical pixel signal is output (step 9). The pixel signals output from the sensor 18 are processed and used by printing the read image with a printer such as a laser beam printer, storing it in a memory such as an optical disk, or transmitting it electronically via an electrical transmission line.

Next, when the operator selects the 10 image reading button 23, the shutter S2 is driven and rotated to a position that blocks the optical path of the imaging lens 13, and the switching mirror 20 is moved to the 20A position around the axis Z-Z. image sensor 18
Only the frame image of fI is formed on the light-receiving range surface 19 and read out (step 8), and the sensor 18 outputs a time-series electrical pixel signal as a read signal. (Step 9) Next, when the operator selects the f2 image reading button 24, the shutter S is driven and rotated to the position where it blocks the optical path of the imaging lens 12, and the switching mirror 20 is moved to the position 20A. It rotates, and only the frame image of f2 is imaged and read out (step 8), and the sensor 18 outputs a time-series electrical pixel signal as a read signal. (Step 9) An optical path is formed so that the frame image f is imaged on the right half of the image sensor 18, and the frame image f2 is imaged on the left half of the image sensor 18.

By selectively operating the buttons 22 to 24 as described above, one or both of the two images can be selectively read.

In the above embodiment, scanning is performed by moving the image sensor, but the image sensor is fixed and the image to be read is moved to perform sub-scanning of the image (slit exposure sub-scanning).
may be done. Further, in the present invention, a two-dimensional array image sensor can be used instead of a one-dimensional image sensor, and the formed image can be read and processed by the electrical main scanning and sub-scanning functions of the two-dimensional image sensor itself.

In addition, in the embodiment, as a method of selectively using the first optical system and the second optical system, a shutter plate is provided at a position where the optical path of each of the first optical system and the second optical system can be blocked. However, each lamp is turned on to illuminate the first original in the first optical system and the second original in the second optical system without providing a shutter plate.

A similar effect can be obtained by turning it off. As the original to be read, not only microfilm but also general documents, books, etc. can be used.

[Effects of the Invention] As described above, the present invention allows one device to capture an image of one of two types of originals by selectively using one or both of the first optical system and the second optical system. It can be read, or it can be read by combining the two.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an outline of an image reading device to which the present invention is applied, Fig. 2 is a diagram showing an outline of an image reading selection button of the above device, Fig. 3 is an operation flow diagram, and Fig. 4 is a conventional one. FIG. 1 is a perspective view showing an outline of the device. Fl, F2...Microfilm f l-f
*...Frame image 15...Half mirror 16...Monitor screen 1 day...One-dimensional array image sensor 20
...Switchable mirror Applicant: Canon Co., Ltd.

Claims (1)

[Scope of Claims] In an image reading device that forms an image on an image sensor and reads the formed image, a first optical system that forms a first image on the image sensor and a second optical system that forms an image on the image sensor and a second optical system that forms an image on the image sensor. An image reading device comprising: a second optical system that forms an image on a sensor; and one or both of the first optical system and the second optical system can be selectively used.