JPS6090462A - Automatic facsimile method of microfilm - Google Patents

Abstract

PURPOSE:To eliminate complex series of adjustment and to allow facsimile of microfilms by simple operation by facsimileing after automatically adjusting light exposure, focus of a coma picture, and a position of a frame range of a coma picture. CONSTITUTION:When a microfiche film 2 is transferred to an optical system, its picture information reaches a licenser 8 through a lense system 3, where luminous energy of a light source 1 is automatically adjusted so that input light exposure is detected and enters a prescribed range. Then the facsimile system compares output voltages for every picture element of the licenser 8, automatically adjusts a distance between the film 2 and the lens system 3, and adjusts focus so that difference between the maximum value, and the minimum value of said output voltage will become maximum. Lastly the system roughly scans picture information of a coma picture with the licenser 8 by rotating a mirror 7 and determines a position and inclination of the coma picture within a range of a rectangular processing frame before adjusting these positions and inclination automatically.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for automatically copying and transmitting microfilm, which automatically adjusts exposure, focus, and film position when copying and transmitting microfilm.

When transporting the microfilm to the exposure position of the optical system and processing the frame images within the area of the rectangular processing frame to perform copy transmission, the exposure, focus, and frame image processing within the area of the rectangular processing frame must be controlled. It is necessary to adjust the position, and although individual methods have been proposed to automatically adjust the exposure, focus, and position of the film frame images, it is possible to automatically adjust the exposure, focus, and position of the film frame images by combining these methods in an appropriate order. Copying and electronic transmission of microfilm was not carried out. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for automatically copying and transmitting microfilm, which automatically copies and transmits microfilm by combining conventional methods and performing them in an appropriate order.

This invention will be explained below.

This invention first automatically adjusts the exposure amount to suit the photoreceptor when transporting the microfilm to the exposure position of the optical system and processing the frame images within the area of the rectangular processing frame to perform copy transmission. Then, the focus of the frame image is automatically adjusted on the photoreceptor 1-, and finally the position of the frame image within the area of the rectangular processing frame is automatically adjusted to perform copying/transmission. This is what I did.

FIG. 1 is a diagram showing a schematic configuration of an optical system of a reader printer to which the method of the present invention can be applied. When a microfiche film 2 is conveyed to the optical system, light from a light source l is irradiated onto the microfiche film 2. The transmitted light from the microfiche film 2 passes through a lens system 3, passes through a slint 4, and is subjected to slit exposure to a photosensitive drum 5 for copying, and after one frame of the image on the microfiche film 2 is exposed to the photosensitive drum 5. , by rotating and moving the photosensitive drum 5 and the recording paper 6 in the direction of the arrow shown in the figure.
The image on the microfinish film 2 is copied onto a recording paper 6. Further, a rotatable mirror 7 is disposed below the lens system 3, and by rotating the mirror 7 and placing the mirror 7 in the optical path as shown by the broken line in the figure, the lens system 3 can be removed from the lens system 3. microfiche film 2
The image information is optically scanned and read by a line sensor 8 as a photoreceptor, and the image information is converted into an electrical signal and copied and transmitted by facsimile or the like.

In the optical system of a league printer having such a configuration, when performing copy transmission such as facsimile, when the microfiche film 2 is conveyed to the optical system, the mirror 7 is first set in the state shown by the broken line in the figure, and the lens system 3 is The image information of the microfiche film 2 from the line sensor 8 is made to reach the line sensor 8. Line sensor 8 as shown in Figure 2
The output voltage V with respect to the input exposure amount has a shape that rises at one point PI, responds linearly, and saturates at point P2,
If the input exposure amount as image information is INI, the output voltage of the line sensor 8 corresponding thereto will be 0UTI, and a saturated portion will occur. Therefore, in order to make the output voltage of the line sensor 8 fall between Vl and V2 shown in the figure, the light amount of the light source 1 is automatically adjusted so that the input exposure amount falls between L1 and L2 shown in the figure. At this time, the input exposure j^ is 1
Since it is between Ll and L2 like N2, it is possible to obtain an output voltage 0UT2 without a saturation part using only the linear response part of the line sensor 8, and the amount of exposure to the line sensor 8 as a photoreceptor is appropriate. Become something.

Next, the output voltages of each pixel of the line sensor 8 are compared to determine the maximum value Vmax and the minimum value Vain, and the difference between the two is Vmax.
The distance 1@LG between the microfiche film 2 and the lens system 3 is automatically adjusted so that max-VIlin is maximized. At this time, the line sensor 8' as a photoreceptor
The contrast of the input exposure amount as image information in -H is the strongest, and the image information is in focus on the line sensor 8.

Finally, by rotating the mirror 7 and roughly scanning the image information of the frame image with the line sensor 8, for example, the frame of the frame image is detected and the area of the rectangular processing frame 9 as shown in FIG. The position and inclination of the frame image 21 are determined and automatically adjusted.

As a result of the above, the image information of the focused and appropriate exposure amount of the frame image t21 of the microfiche film 2 located at the correct position within the area of the rectangular processing frame 3 is transmitted on the line sensor 8. By rotating the mirror 7 and scanning the image information of the frame image 21 with the line sensor 8, copying and electronic transmission is performed.

As described above, according to the present invention, since exposure, focus, and film position are automatically adjusted to perform copying and transmission, the advantage is that it is freed from a series of complicated adjustments and can easily perform copying and transmission. There is. Furthermore, it goes without saying that the microfilm is not limited to fish film, and other known films such as roll film and jacket film may be used.

Note that in the above method, the film position was adjusted immediately after the image information was focused by maximizing the contrast. Therefore, the film position may be adjusted after adjusting the exposure amount again. Also, as a method for adjusting the focus,
In addition to the two-way method, as shown in FIG. It is also possible to adjust LG. Furthermore, if the optical path length between the light source 1 and the line sensor 8 is made the same as the optical path length between the light source 1 and the photosensitive surface of the photosensitive drum 5, the method of the present invention can also be applied to copies using photosensitive drums. It is Noh.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of an optical system of a reader printer to which the present invention can be applied, FIG. 2 is a diagram showing characteristics of a line sensor 8, and FIG. 3 is a diagram illustrating position adjustment of frame images. , FIG. 4 is a diagram for explaining another example of focus adjustment. 1... Light source, 2... Microfiche film,
21... Frame image, 3... Lens system, 4... Slit, 5... Photosensitive drum, 6... Recording paper, 7...
Mirror, 8... line sensor, 9... rectangular processing frame. Applicant's agent Yu Yasugata 42 Figure 3 Figure 4

Claims (1)

[Claims] When transporting the microfilm to the exposure position of the optical system and processing the frame images within the area of the rectangular processing frame for copy transmission, the exposure is first automatically adjusted to suit the photoreceptor, and then The focus of the frame image on the photoreceptor l- is automatically adjusted, and finally the position of the frame image within the area of the rectangular processing frame is automatically adjusted to perform copying and electronic transmission. A method for automatically copying and transmitting microfilm, characterized by: