JPS6152064A - Microfilm reading device - Google Patents

Abstract

PURPOSE:To display for retrieval speedily and compactly by arranging one dimensional sensor as a highly fine picture reading sensor and arranging two dimensional sensor as the sensor monitoring a picture speedily. CONSTITUTION:A picture on a microfilm is read by high resolution with one dimensional sensor. For driving of two dimensional sensor 43, a signal is outputted in a time series by frequency synchronized to a scanning line of CRT and the picture is displayed on the display surface. Two dimensional sensor 43 consists of a sensor array shift register 40, a vertical shift register 41 and a horizontal shift register 42. An output signal from two dimensional sensor is made binary by a binarization circuit 46. Signals of three lines of the output signal, a horizontal synchronous signal phiH, a signal from a clock generating circuit 45, and a vertical synchronous signal phiV are inputted through a terminal change- over switch 47 to a CRT driving circuit 48 of NTSC system and a reading picture is displayed at a CRT49.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microfilm reading device that electrically reads image information on a microfilm.

2. Description of the Related Art Conventionally, information such as documents generated in large quantities is recorded in a high density on microfilm, and necessary information can be easily obtained from this microfilm.A typical example is a patent publication. The first page of this patent publication records the name and classification of the invention, the applicant, the scope of claims, etc., and the second and subsequent pages contain a detailed description of the invention and drawings.

When using a microfilm in which one page of this patent publication is recorded frame by frame, use the microfilm search device attached to the reader printer to find the frame of the first page of the desired patent publication on the microfilm. Search, observe the frames on the first page on the screen, and see this 1. ￥
They considered whether the official gazette was necessary and, if necessary, obtained a copy of it.

The only way to obtain this copier is to electrically read the image information on the film using a photoelectric conversion element such as a COD, output the image information as an electrical signal, and copy it using a laser beam printer, etc. based on this image information. There is a way to get the image. This method of handling an image as an electrical signal is an effective method for performing image processing such as electronically transmitting one image, storing it in a disk memory, etc., enlarging it, reducing it, and editing it.

FIG. 1 shows a conventional reading device for photoelectrically reading images on microfilm. I1? A microfilm F of the shape is stored in the cartridge 1, and the capstan roller 2 and the pinch roller 3 hold the cartridge 1.
The film is fed out from the film guide member and kite rollers 4 and 5 (not shown) to a take-up reel 6, and is wound onto the take-up reel 6 driven by a motor (not shown).

Microfilm F has, for example, a frame f in which many patent publications are recorded in page order, and a frame mark m recorded on the bottom side of each frame.
1 and an issue mark m2 recorded on the upper side of the frame in which information on the first page of each patent publication is recorded. The microfilm F is illuminated by a lamp 7 at a predetermined position, and the information of the illuminated frame is transferred by a lens 8 onto the scanning surface of a one-dimensional photoelectric conversion means (hereinafter referred to as a one-dimensional sensor) 9 such as a COD (charge-coupled device). imaged. A guide 10 provided on the main body of 5 electrically scans the one-dimensional sensor 9.
By driving and scanning along the wire 11 by the motor 12 via the wire 13, the information of the frame positioned at a predetermined position is read.

14 is a frame detector that detects the frame mark m1.

Reference numeral 15 denotes a subject mark detector for detecting the subject mark m2.

The frame mark m1 and the subject mark m2 have different densities from the surroundings (base density of the film), and the lamp 7 and each detector 14.1
5, the mark recording section of the microfilm passes between the frame mark detector 14 and the subject mark detector 15.
The incident light is interrupted by the marks, and each detector outputs a mark signal.When the zero mark detector 15 detects the mark, it counts the number of mark signals output, and stops the film advance based on the count value. The microfilm is stopped at the predetermined illumination position.

The operator uses half mirror 16 and attachment lens 1.
7. Monitor the image projected on the optical screen 20 via the mirrors 18 and 19, confirm that it is the desired patent, and press the copy button. This causes the reading operation using the one-dimensional sensor 9 described above. Start. Then, a copy image is obtained using this read output.

However, the mirror arrangement for forming the optical path of the optical screen optical system for the monitor of the searched frame is complicated.
It has several disadvantages, such as requiring a large space to secure the optical path, making the entire reading device large, and making it difficult to move the screen to match the operator's position.

Therefore, it is conceivable to electrically display the image converted into an electrical signal on a display such as a CRT. That is, CR
Electrical image display devices such as T and others eliminate the above-mentioned drawbacks and have the advantage that they can be used in common with display devices such as other optical disk file devices and image editing devices. but,
As mentioned above, conventional image reading devices perform reading using a one-dimensional sensor, and when outputting an image to an NTSC CRT using an image signal from the one-dimensional sensor, a page is used to store one read signal for one page. Since a memory and a circuit for converting the image output speed or density into the scanning line speed or density of the CRT are required, the entire device becomes expensive.

Furthermore, displaying the image on the CRT after the film has stopped requires at least 1.5 seconds of scanning time using a one-dimensional sensor, which has the drawback of slowing down the search speed.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a compact image reading device that can display images for searches, etc. at high speed.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows an embodiment of a microfilm reading device according to the present invention.

A microfilm retrieval section similar to that shown in FIG. 1 described above is fixed to an intermediate plate 22 parallel to the bottom plate 21 of the main body of the apparatus. Further, the bottom plate 21 includes a halogen lamp 22, a lens 23. An illumination unit 25 consisting of a mirror 24 is attached, and its luminous flux illuminates the stage 26 on which the microfilm retrieved through the window of the intermediate plate 22 is stopped. This illumination luminous flux is transmitted through a magnifying lens 27 to improve the efficiency of correcting light intensity unevenness.
image is formed in the eyes of The image area of one frame of the illuminated microfilm is imaged by a magnifying lens 27 fixed to the side plate of the retrieval means onto a two-dimensional photoelectric conversion means 28 (hereinafter referred to as two-dimensional sensor) consisting of 500 x 400 cells. Ru. This two-dimensional sensor 28 is fixed to a top plate of the apparatus (not shown).

Further, between the magnifying lens 27 and the two-dimensional sensor 28, a half mirror 29 is supported by a support member (not shown) on the side plate of the retrieval means at an angle of 456 with respect to the optical axis. The upper part forms the imaging surface for the microfilm. On this Mt plane j: 5000 bit
+7) The CCD 30 is supported so as to be able to scan the imaging plane along the guide F axis 32, 33 of a guide unit fixed to the back side plate 31. In addition, the COD carriage 34 is connected to a drive motor pulley 35 and a fixed pulley 3 arranged on the back side plate 31.
6, and is connected to a wire 37 that is routed around 6 and 6, and is scanned back and forth by the rotation of a drive motor 39. This CC
Using the D 30, the image of the desired frame searched in the same manner as in Fig. 1 is read.The cell direction of the CCD 30 is parallel to one side of the image area of the microfilm, and the standby position is in this image area. is coincident with or outside one side of .

There are 50 images on microfilm taken at 1/24.
It is possible to read with a high resolution of 16 pels using a 00 bit CCD 30, and even small print such as patent publications can be identified by a laser beam printer or the like.

Also, the drive circuit for the two-dimensional sensor 28 mentioned above is as follows.

A signal is output in time series at a frequency synchronized with the scanning line of the CRT, and the image of the illuminated microfilm is transmitted to a CRT (not shown).
It can be displayed on the display surface of electrical display means such as RT.

FIG. 3 shows a method of driving a two-dimensional sensor.

A two-dimensional sensor (inside the broken line) 43 includes a sensor array shift register 40 and a vertical shift register 41 . It consists of a horizontal shift register 42.

Here, for the sake of simplicity, a two-dimensional sensor with 20 cells Sll to S4S will be taken as an example.

(1) From the clock generation circuit 45, a vertical synchronization signal (small V
) are generated, Sll, S21, "El.

Sdl and S13 ・SZB ・SBB・5. i3 and SI
S.

S2S, 35. The signal of the sensor array in S45 is shifted to the vertical shift register 41.

(2) Next, the horizontal synchronizing signal (φH) is input to the vertical shift register drive circuit 44, and the shift clocks (φv1, φVz) output from the same circuit 44 cause the horizontal shift registers 2S, 5, and S4S to ．． SS will be done.

(3) The horizontal shift register 42 is a horizontal shift register drive circuit 42 operated by the CCD shift clock CLK.
The signals are sequentially shifted by S45→S King→S25→
Output SIs.

(4) Horizontal synchronization signal φH is input sequentially and thereafter S4.3 →
S13. S41→S11 is output from the two-dimensional sensor.

(5) When the vertical periodic signal φV is generated again, S 12
-,'SZZ;"-z・"42 and S+4-524'
The signals of the sensor arrays 534L and S44 are shifted to the vertical shift register 41, and the above (2) to (4) are performed.
cr+method test s44. s, 4-, s, →512 is output.

By the above method, interline image reading scanning is performed. Actually, the above two-dimensional sensor has 500
It is composed of an X600 matrix.

The output signal from the two-dimensional sensor is binarized by a binarization circuit 46. This output signal (Video signal)
The three lines of signals, ie, the horizontal synchronizing signal φH1 and the vertical synchronizing signal φV, which are the signals from the clock generation circuit 45, are inputted to the NTSC type CRT drive circuit 48 via the terminal VJ conversion switch 47, and the read image is transferred to the CRT 49. will be displayed. The terminal changeover switch circuit 47 also receives video signals, vertical synchronization signals, and horizontal synchronization signals from word processors and other terminal vi devices, and switches the connection to the CRT drive circuit depending on the equipment used. .

This allows the CRT to be used not only as a microfilm monitor but also as a monitor for other office equipment.

As explained above, if a one-dimensional sensor is placed as a high-definition image reading sensor, and a two-dimensional sensor is placed δ as a sensor that reads images at high speed, high-speed search and It becomes possible to display the searched image and output the product quantity Ml+image.

Note that although the two-dimensional sensor used in the above description is composed of a COD, it is obvious that it is also possible to use an image pickup tube conventionally used in a video camera or the like. In this case, a relay lens is used between the half mirror and the image pickup tube depending on the reading area of the image pickup tube, and the image pickup tube is arranged on a plane conjugate with the one-dimensional sensor. Also, in addition to this, M
An image pickup plate such as an O5 type area sensor or CID is also possible.

Furthermore, in addition to CRT, display devices such as liquid crystal displays and plasma displays can also be used as display devices. In addition, devices that output high-definition images are available in addition to various printer devices such as laser beam printers and inkjet printers. An electrophotographic display device using an electrophotographic method disclosed in Japanese Patent No. 58-98746 can be used.

As explained above, according to the present invention, images of searched microfilm frames can be monitored at high speed, the configuration of a complicated optical system for monitoring can be simplified, and the device can be made smaller. This contributes to

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional microfilm reading device, FIG. 2 is a block diagram of a microfilm reading device according to the present invention, and FIG. 3 is an example of a circuit configuration for image monitoring using a two-dimensional sensor. In the figure, 28 is a two-dimensional sensor, 29 is a half mirror 130 is a CCD, and 49 is a CRT. 3rd fan

Claims (1)

[Claims] A one-dimensional reading means for reading an image on a microfilm with high resolution, a two-dimensional reading means for reading the same image in order to monitor the same image, and a display means for displaying an image based on the output from the two-dimensional reading means. A microfilm reading device comprising: