JPS61222361A - Microfilm reader - Google Patents

Abstract

PURPOSE:To attain frame retrieval with high accuracy without need of other photodetector by using an image pickup element for reading a film image so as to detect a blip mark. CONSTITUTION:When an instruction retrieving a frame designated by an operation section 27 is inputted, a control section 25 outputs a signal to a scanning mirror derive section 21 to move the 1st and 2nd scanning mirrors 5, 9 to the left, and when a signal representing the positions 5c, 9c from a scanning mirror retrieval position detection sensor 30 is inputted, the drive is stopped. The control section 25 inputs a signal to a lamp illuminance setting section 23 to bring the illuminance of the lamp 3 to a value suitable for the detection of a CCD 10 for a blip mark 11, an instruction is given to a microfilm drive section 22 to carry a microfilm 1. In such a case, the blip mark 11 is detected by the CCD 10 and when number of frames counted by an image sensor control section 28 reaches a designated frame, a signal repesenting carrying stop of the microfilm 1 is sent to a microfilm drive section.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a microfilm reading device, and more particularly to a microfilm reading device equipped with an image sensor for reading an enlarged projected image of a microfilm image.

Conventional technology Conventionally, light is irradiated from the back of a microfilm, and the light is enlarged and projected onto a screen via an optical system such as a projection lens and a reflection mirror, while the optical system is displaced to switch the projection optical path. There has been a reader printer that forms an image on a photoreceptor drum and forms an electrostatic latent image on the photoreceptor drum. In such devices, when searching for a film frame, a separately provided document mark sensor (hereinafter referred to as DMS) detects a blip mark for film frame search provided at the edge of the film and generates a detection signal. Processing such as counting was performed.

Furthermore, in recent years, electronic file systems that convert images into electronic signals and file them have become popular, and it has become necessary for microfilm reading devices to convert microfilm images into electronic signals as well. Therefore, instead of the photoreceptor drum of the reader printer mentioned above, a CC
A microfilm reading device that uses an imaging device such as D, forms a film image on the imaging device, and converts the microfilm image into an electronic signal can be considered.

In such a microfilm reading device, there is a method in which microfilm frames are sequentially projected onto a screen, information is selected visually by an operator, etc., and the required microfilm image is read by an image sensor. There is a method of mechanically searching for provided blip marks and sequentially reading microfilm images.

Problems to be Solved by the Invention However, in order to mechanically search for microfilm frames and read images on the microfilm as described above, a light receiving element as a DMS is required, and image reading is difficult. image sensor and DM for piece search
Since two light-receiving elements, S and S, are used, there is an inconvenience that costs are increased.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an inexpensive microfilm reading device that can convert images of microfilm into blip marks and does not require a dedicated light-receiving element for detecting blip marks. do.

Means for Solving the Problems The present invention is characterized by comprising: an image sensor for reading a microfilm image; an optical means for projecting the microfilm image onto the image sensor; and the microfilter when searching for a microfilm frame. do.

When searching for a frame on the working microfilm, the optical means is displaced to project a blip mark onto an image pickup device for reading the film image. This image sensor detects blip marks and searches for frames on the microfilm.

Embodiment FIG. 1 is a sectional view schematically showing the optical system of a microfilm reading device. In this microfilm reader, in the reader mode, the microfilm (11) is illuminated by the light of the lamp (3) which is made into parallel light by the condenser lens +21, and its image is projected by the projection lens (
4), the first scanning mirror (5) stopped at the solid line position;
The image is enlarged and projected onto a screen (8) through a half mirror (6) and a fixed mirror (7).

On the other hand, in the reading mode, the light image of the microfilm (1) is slit-exposed onto the CCD dv via the first scanning mirror (5), the half mirror (6), and the second scanning mirror (9). That is, the first scanning mirror (5) and the second scanning mirror (9) are fixed to a frame (not shown) so as to be perpendicular to each other so that they can integrally move horizontally back and forth, and in the reading mode, they are at the solid line position. When switched to the printer mode, it moves along the movement path to the right in the figure to positions (5a) and (ga) indicated by broken lines, and from this position to (5b) on the left in the figure. .

It moves at a constant speed toward the position (9b) and performs the final exposure. The image exposed on the CCD (IQ) is
The signal is converted into an electrical signal by a CCD (IQ) and sent to an image signal memory, printer, etc. (not shown).

Furthermore, when searching for a frame on the microfilm (1), the first scanning mirror (5a) and the second scanning mirror (9a)
moves to the positions (5c) and (9c) indicated by the dashed-dotted line on the left side of the figure, stops, and transfers the light image of the blip mark (111) provided at the edge of the microfilm (1) onto the CCD (IQ). Blip mark (1
11 is detected.

FIG. 2 is a block diagram showing the control relationship of each part of the microfilm reading device. (G) is a control unit that controls the microfilm reading device shown in Fig. 1, and the input port of the control unit has an operation unit that performs mode settings, recall frame settings, etc., and an image that controls the CCD. Example of sensor control section, 1st. Second scanning mirror 151, +91
There are five sensors installed on the reader printer body to detect the position of the scanner, scanning mirror reader position detection sensor,
A scanning mirror search position detection sensor (2), a scanning mirror image leading edge position detection sensor (31), and a scanning mirror image trailing edge position detection sensor (support) are connected. In addition, the output port of the control unit includes a scanning mirror drive unit C1), a lamp illuminance setting unit for switching the lamp illuminance of the microfilm drive unit to an appropriate value according to the mode, the current number of microfilm frames, etc. A display section 1 for displaying 1 and an image sensor control section (2) are connected.

In the above configuration, when a command to search for a piece specified by the operation unit τ is input, the control unit outputs a signal to the scanning mirror drive unit 121), and the control unit outputs a signal to the first and second scanning mirrors (5C). , (Move 91 to the left in the figure, and from the scanning mirror search position detection 7th field, 1° 2nd scanning mirror + 5
When a signal indicating that 1 and +91 have reached positions (5c) and (9C) is input, driving is stopped. Furthermore, the control unit inputs a signal to the lamp illuminance setting unit to set the illuminance of the lamp (3) to a value suitable for detecting the blip mark αD on the CCD (1), and instructs the microfilm drive unit. , the microfilm (1) is conveyed. At this time, the blip mark αD is detected by the CCDQ■, and the image sensor control unit (when the number of frames counted on the lees reaches the designated frame, the conveyance of the microfilm (1) is stopped. The signal is sent to the microfilm drive section.

Next, when the reader mode is designated by the operation unit 10, a signal is sent to the control unit +25):s and the scanning mirror drive unit 21) to stop the first @ second scanning mirror t5+ and (9) at the solid line position. When the microfilm (1) is projected onto the screen (8) by increasing the illuminance of the lamp (3) to an appropriate value, the control unit controls the first and second scanning mirrors 151, +81. Move to the right, (5a)
, (9a) are scanned leftward to the positions (5C) and (9C).In this way, the image of the exposed microfilm (1) is transferred to the CCD.
An image is formed on fi[), synchronized with the scanning speed by the image sensor control section (support), and converted into an electrical signal.

In addition, one blip mark is provided on each frame of microfilm at the top and bottom ends, so when searching for microfilm, it is possible to read two blip marks at once. , the image reading direction of the image sensor may be perpendicular to the image reading direction of the embodiment shown in FIG.

Effects of the Invention As is clear from the above explanation, since the detection of blip marks is carried out using an image sensor for reading film images, there is no need for any other light-receiving element, reducing costs and making it possible to image enlarged blip marks. Since detection is performed using elements, highly accurate piece searches can be performed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view schematically showing the optical system of the reader printer, and FIG. 2 is a block diagram showing the control relationship of each part of the reader printer. (11...Microfilm, (3)...Lumph'
, (4)... Projection lens, (5)... First scanning mirror, (6)... ノ\-7 mirror, (7)... Fixed mirror, (8)... Screen, (9)...Second scanning mirror, (10)...CCD1 (111...Blip mark.

Claims (1)

[Scope of Claims] An imaging device for reading a microfilm image; an optical means for projecting the microfilm image onto the imaging device; A microfilm reading device comprising: means for displacing the optical means so as to project onto an image sensor.