JPS62197869A - Picture retrieving device - Google Patents

Abstract

PURPOSE:To stop a picture accurately at a prescribed position and to avoid the omission, etc. of a copied image by setting two sensors with a space secured by an amount equal to a distance double as much as the moving amount of a picture supporter obtained between the output of a specific stop signal and the stop of the picture supporter. CONSTITUTION:The space L between both sensors 21 and 22 is set in both film feeding directions (a) and (b) at a distance double as much as the film moving amount l1-l2=l4-l3 obtained between the output of a film feed stop signal and the actual stop of film. The distance between the right end of a mark (m) and the reference position Z is equal to l2 l4 when the film is stopped in each feeding direction as long as the film feeding speed is constant. Thus the film is stopped in a state where the mark (m) is always kept approximately at the same position regardless of the film feeding direction. Therefore, a desired picture frame A is stopped at a fixed position regardless of the film feeding direction. Then the space L can be changed in response to the film shift amount in case the film feeding speed is not fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image retrieval device for stopping a desired image at a predetermined position on an image support such as a film long paper on which a large number of images are recorded.

[Prior art]

Conventionally, the film used in search devices built into microfilm readers etc. has counting marks on the side edges of each frame of the film, and by detecting and counting the marks, the film is The desired image above will be automatically searched.

The above search device illuminates the mark on the film with a lamp, detects the luminous flux from the mark with a mark detector equipped with a photoelectric conversion element as the film is moved, and inputs the counting contents of this counter and the keypad. The comparison circuit compares the desired frame number with the desired frame number, and when the two match, the comparison circuit issues a stop signal to the drive control circuit, which stops the drive system that transports the film and projects the desired frame image onto the screen. It is designed to be held still at a predetermined position [K].

FIG. 7 shows a film stop state of a conventional retrieval device.

Here, arrows a and b indicate the feeding direction of the film F, and 1 and 2 are photoelectric conversion elements for mark detection arranged apart in the feeding direction of the film F. The photoelectric conversion element 2 is arranged so that when a blank area (non-mark area) 't- is detected, the photoelectric conversion element 2 detects the mark mf. Mu, for.

t, , t, Fi is the distance from the reference position 2 to the right end P of the mark m. The mark m is attached to the same side of each frame. In the feeding direction a, b [in each photoelectric conversion element 1,
The relationship between 2 and mark m is shown in Figure 7 (a).

When the state shown in (c) is reached, a film feeding stop signal is issued, and then the film feeding is stopped at the position shown in FIG. 7 (b) and (d).

However, when the film stops, depending on the feeding direction, the distance from the reference position 2 to the right edge P of the mark is 4. t4 do not match, and the mark stops at different positions.As a result, if the image is too large, the image may deviate from the screen projection range of a part of the reader, or may deviate from the print range of a part of the printer, causing part of the image to be removed from the copy sheet. This often causes problems in practical use.

Additionally, in order to solve this problem, a conventional method has been used to limit the film feeding direction immediately before the film stops to a fixed direction (a or b), but this method improves the accuracy of the stop position. However, the drawback was that the search time was long.

〔the purpose〕

The present invention provides an image retrieval device that can stop an image at a fixed position and correctly project the entire image onto a projection surface regardless of the feeding direction of the image support, and can also shorten the search time. It is something to do.

[Means to solve the problem]

The present invention provides an apparatus for stopping an image support by sequentially detecting marks on an image support with marks corresponding to images using at least two sensors. When the sensor does not detect a mark, it outputs a stop signal, and the sensors are spaced apart by a distance twice the amount of movement of the image support until the image support stops after outputting the stop signal. It is characterized by the following.

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

FIG. 2 shows a reader printer to which the present invention is applied, in which 3.4 is a reel for winding microfilm F into a roll, 5 is a capstan roller for film feeding, and 6 is a reel for winding microfilm F into a roll.
is a pinch roller.

The capstan roller 5 is connected to a forward/reverse motor (not shown) K so that the microfilm is fed from reel 3 to reel 4, and then from reel 4 to reel 3, depending on the rotational direction of the motor. Rotate. Reference numerals 7 and 8 designate a film guide row 2-19 as an illumination lamp; 10 as a condenser lens; and 11 as a lens for enlarging and projecting the image frame of the microfilm illuminated by the lamp 9 onto the photoreceptor 12.

A mirror (not shown) is arranged between the lens 11 and the photoreceptor 120 so that it can be moved in and out of the projection optical path, and when the mirror is placed in the optical path, the image frame of the microfilm is projected onto a screen (not shown) via the mirror. . This is a mark detector that detects marks on 13Vi microfilm.

Microfilm F has each frame A as shown in Figure 3.
An image is recorded in , , A, , A, ...An, and there are marks m on the same side of each frame that have different densities than the surrounding area.
is recorded.

As shown in FIG. 4, the mark detector 13 includes at least two photoelectric conversion elements (hereinafter referred to as sensors) 21.
Consists of 22. Each sensor 21, 22 is arranged opposite to a lamp 9 with the microfilm F in between, and the sensor generates a pulse signal when the light beam from the lamp 9 is interrupted by the mark or the base of the film.

Note that the optical signal from the microfilm may be received by a sensor via a light guiding member such as an optical fiber.

In this example, a microfilm with an opaque mark and a transparent base is used, but the mark is transparent.

It is also possible to use films with an opaque base.

The sensors 21,22 are arranged closely spaced apart in the film transport direction.

FIG. 5 shows a search control circuit; 15 is an input device for inputting the frame number of a desired image to be searched and storing this input number; Addition depending on the film feeding direction
Sma7' (is a counting device for subtraction counting, 17 is an input device [1
This is a comparison circuit that compares the frame number inputted in the frame number 5 and the count value of the counting device 16, and outputs a stop signal when the two match. 18 is a brake device which is activated when a stop signal is sent from the comparator circuit 17 to completely block the rotation of the geared tan roller 5, and also stops the motor that rotates the capstan r''-ra 5 to stop the microfilm. let

19 is an inverter, 20 is a motor control circuit, and 14 is an AND gate. When the sensors 21 and 22 receive the light that has passed through the blank area of the microfilm (the film's pace area), they output a low-level signal, and when they receive the light from the mark m, that is, they detect the incident light due to the mark mK. Outputs a signal at no-i level when it is cut off.

When the microfilm is fed, the sensor 21 does not receive light from the blank area, and the sensor 22 does not receive light due to the mark m, the AND gate input terminals 141 and 148 A high level signal is input, and a mark detection signal is output from the AND gate 14.

This frame detection signal activates the υ counting device 16 and the comparison circuit 17, and compares the counted value with the input frame number. When the frame number stored in the input device 15 and the value in the counting device 16 do not match, the motor is driven to feed the film in a predetermined direction, and when they match, a stop signal is output from the comparison circuit 17, and the pre-gage is started. Device 18 is activated to stop the film.

FIG. 1 shows the arrangement of the sensors 21 and 22 according to the present invention. If the distance between the sensors 21 and 22 is L, they are arranged so that L = 2 (t+ 4) = 2 (44) . Here, (zt-t, ) and <t+-tm) are 1 in the film feeding directions a and b, respectively, as shown in FIG. 7, and in the states shown in FIG. The film travels from when the film feed stop signal is output to when the film actually stops in the state shown in Figure 7 ←) and ), and L represents the distance traveled by the next film.
set to twice the distance.

Fig. 6 explains the state in which the film is stopped by the output of the sensors arranged at the interval set in the above embodiment, and Fig. 6 (a) shows the state in which the film is stopped in the film feeding direction The mark detection signal output position, Figure 6 (c) is the mark detection signal output position when the film feed direction is ``A'', and Figure 6 (b) is the film stop position when the film feed direction is ``a''. ) indicates the film stop position in the film feeding direction. The film feeding speed is assumed to be constant. When the film stops in each feeding direction, the distance from the right edge of the mark m to the reference position Z is t1#Z4, and the film is always placed at almost the same position regardless of the film feeding direction. stops. As a result, the desired image frame can be captured regardless of the film feeding direction.
It will stop at a certain position.

If the film feeding speed is different from the above example, it is necessary to change the distance between the two sensors in accordance with the change in film feeding speed, and the distance between the film feeding speed from when the stop signal is issued to when the film actually stops is The distance may be set according to the amount of movement. If the film feeding speed is not constant, the present invention can be applied to an information retrieval device that uses a reel drive system instead of a capstan roller drive system, for example.

In addition, when the sensor detects the projected image of the mark, the distance between the sensors 21 and 22 may be set based on the moving distance of the film image projected onto the sensor.

Furthermore, when light from a mark is received by a sensor via an optical fiber, the interval between the tips of a pair of optical fibers arranged corresponding to each sensor may be set based on the above embodiment.

If there are two or more marks of different sizes on the film, determine the size of the marks, then place three or more sensors, and use two of those sensors to determine the entire stopping position of the film. good.

In the above embodiment, the search operation is performed by inputting the desired frame number, but the +1 key or -1 key is also used to advance the film by one frame using the marks and to automatically stop it. Alternatively, the present invention can also be applied to a case where a search operation is performed by operating an intermittent advance key that automatically advances the film intermittently one frame at a time.

〔effect〕

As described above, according to the present invention, it is possible to accurately stop an image at a predetermined constant position regardless of the direction of movement of the image support, and it is possible to prevent missing copies and the like.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the arrangement of sensors according to the present invention, FIG. 2 is a schematic configuration diagram of a reader printer to which the present invention is applied, and FIG. 3 is a diagram showing the next image information recorded on a film,
A diagram showing the relationship between marks. FIGS. 7(a) to 7(b) are diagrams illustrating a stopped state of a film according to the present invention, and FIGS.

Claims (1)

[Claims] In a device for stopping the image support by sequentially detecting marks on an image support with marks corresponding to images by at least two sensors, one sensor detects the mark and the other sensor detects the mark. An image retrieval device that outputs a stop signal when the image support is not in use, and has sensors spaced apart from each other by a distance twice the amount of movement of the image support from when the stop signal is output until the image support stops. .