JPH04324433A - Retrieval device - Google Patents

Abstract

PURPOSE:To provide the retrieval device which sets the detection position of the quantity of transmitted light to an optional position from an end part of a microfilm. CONSTITUTION:The retrieval device having a light source 11 withwhich the microfilm 1 imparted counting marks 51 is irradiated and a counting means 53 which detects the quantity of transmitted light of the irradiated microfilm 1, determines the reference value of the quantity of transmitted light according to detection data, and counts the counting marks 51 corresponding to the reference value is equipped with a keyboard 18 which sets the detection position of the quantity of transmitted light in an optional area from the tip part of the microfilm.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retrieval device that transports a long microfilm and searches for a desired image frame by counting counting marks provided on the microfilm.

0002

[Prior Art] Conventional search device of this type
No. 121436, etc.) is equipped with a light source such as a halogen lamp, and a counting means consisting of an optical fiber, a photoelectric conversion element, an amplifier circuit, etc. Then, while transporting the long microfilm, the microfilm is irradiated with a light source, and the number of counting marks that block the transmitted light is counted to search for a desired image frame.

By the way, prior to the above search, FIG. 5(A)
Normally, in order to ensure the search for the microfilm 100, the amount of transmitted light through the microfilm 100 is detected in advance and a table of detected values is created, and when searching for the image frame 102, the reference value of the amount of transmitted light is used. The counting means is configured to count the counting marks 103 in accordance with (threshold value).

In order to create such a table, hardware is set so that the light amount is detected at a distance X from the edge 101 of the transparent microfilm 100, that is, in an area Y. (determined). Therefore, in order to accurately detect the amount of light, it is necessary that the microfilm 100 has a constant length from the end portion 101 to the area Y count mark, transparency, etc.

[0005]

[Problems to be Solved by the Invention] However, the above conventional example has the following problems.

[0006] The leading end of the microfilm 100 may be bent or damaged due to the load or jam caused by the ejecting mechanism during auto-loading. In this case, the microfilm 100 is shortened as shown in FIG.
The amount of light cannot be detected.

[0007] On the other hand, when the microfilm 100 becomes short as shown in (■), a transparent leader tape 104 is spliced to the microfilm 100 using a splice tape 105 as shown in FIG. 5(C). Sometimes.

However, there are cases where the difference between the base density of the microfilm 100 and the base density of the leader tape 104 is large, and there are also cases where fog exists on the leader tape 104. If the reference value is determined by collecting data by detecting the amount of transmitted light irradiating the leader tape 104 with a light source, there is a risk that an error in counting the count mark 103 will occur when searching the microfilm 100.

■ If black is used as the splice tape 105, the splice tape 105 will block the irradiation light from the light source during retrieval, and the counting means will count the splice tape 105 as a counting mark.
This leads to search errors.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a search device that can set the detection position of the amount of transmitted light at any position from the end of the microfilm.

Another object of the present invention is to provide a retrieval device that can set the detection position based on the amount of transport of the microfilm.

0012

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a light source that irradiates a microfilm provided with a counting mark, detects the amount of transmitted light of the irradiated microfilm, and calculates the amount of transmitted light from the detected data. In the retrieval device, the retrieval device has a counting means for determining a reference value of , and counting counting marks in accordance with the reference value, further comprising an input means for setting the detection position of the amount of transmitted light to an arbitrary position from the edge of the microfilm. Established.

Furthermore, the input means may be configured to set the detection position based on the measured value of the measuring means for measuring the amount of transport of the microfilm.

[0014]

[Operation] In the present invention based on the above configuration, the input means sets the detection position of the amount of transmitted light at an arbitrary position from the end of the microfilm. When the light source illuminates the detection position of the microfilm, the counting means detects the amount of light transmitted through the microfilm and determines a reference value of the amount of transmitted light based on the detection data. Then, during the search, the counting means counts the counting marks in accordance with the reference value.

Further, the measuring means measures the amount of transport of the microfilm, and the detection position is set based on the measured value of the measuring means.

[0016]

[Embodiment] Next, a first embodiment of the present invention will be explained based on FIGS. 1 and 2. FIG. 1 is a schematic configuration diagram of a microfilm retrieval device to which the present invention is applied, FIG. 2(A) is a block diagram showing the main circuit configuration, and FIG. 2(B) is a plan view of the microfilm. In FIG. 2, reference numeral 1 indicates a long microfilm on which counting marks 51 are provided corresponding to image frames 50. As shown in FIG. The microfilm 1 is housed in a cartridge 3 in a state where it is wound around a rewind reel 2 as shown in FIG. A pair of plate-shaped glasses 4 are placed in the transport path 52 of the microfilm 1.
, 5 are arranged vertically facing each other. The glasses 4 and 5 are in close contact with both surfaces of the microfilm 1 to provide flatness, and are configured to be moved in the thickness direction by a solenoid or the like (not shown). Note that 6 is a take-up reel. Further, in FIG. 2, 1' is a leader tape joined to the microfilm 1 using a splice tape S.

Reference numeral 7 denotes optical fibers arranged on the upper surface of the glass 5. The optical fibers 7 are arranged in a straight line at a predetermined pitch along the conveying direction. The optical fiber 7 takes in the transmitted light of the microfilm 1 irradiated by a light source to be described later, and reads the count of the counting mark 51 and the size of the counting mark 51. 8 is a projection lens, microfilm 1
The image is enlarged and projected onto a screen 14 via a reflecting mirror 13. 9 is a photoelectric conversion element such as a phototransistor that converts transmitted light taken in by the optical fiber 7 into electricity, and 10 is an amplifier circuit that amplifies the minute output current input from the photoelectric conversion element 9. This amplifier circuit 10 is configured to generate an output when the input from the photoelectric conversion element 9 exceeds a certain slice level (threshold value), and otherwise does not generate an output. 21 is a mark counting circuit that counts the counting marks 51 based on the output from the amplifier circuit 10, that is, the data of the detected value of the amount of transmitted light, and the instruction from the CPU circuit 16. The optical fiber 7, the photoelectric conversion element 9, the amplifier circuit 10, the mark counting circuit 21,
The CPU circuit 16 constitutes the counting means 53 of the present invention.

Note that the amplifier circuit 10 includes a photoelectric conversion element 9
It is also possible to adopt a configuration in which all the inputs are amplified, and the slice level of the amplified value is determined by the CPU circuit 16.

On the other hand, below the glass 4, a light source 11 made of a halogen lamp or the like and a condenser lens 12 made of a condenser lens or the like are provided. 15 is rewind reel 2
, a carrier control circuit that controls the feeding relationship of the motors M1, M2, etc. that drive the take-up reel 6. The CPU circuit 16 receives a carrier control signal from the carrier control circuit 15, a mark signal from the mark counting circuit 21, and a keyboard (
Input means) Controls the input signal from 18. 17 is a switch such as a numeric keypad on the keyboard 18, 19 is an LED,
The display section 19 is a display section such as an LCD, and displays the odometer value, the address at the time of retrieval of the image frame 50 of the microfilm 1, and the like. Reference numeral 20 denotes a control knob, and loading and feeding of the microfilm 1 can also be performed by operating this control knob 20.

22 is a rubber roller for an odometer;
A slit disk 23 is fixed to one end thereof, and the rubber roller 22 and the slit disk 23 rotate together. 24 is a photo sensor which generates pulses by rotating the slit disk 23. The rubber roller 22, slit disk 23, and photosensor 24 constitute the measuring means 25 of the present invention.

Next, the operation of the above embodiment will be explained based on the flowchart of FIG. First, when the control knob 20, which is a loading switch, is manually operated (n1), the CPU circuit 16 is activated by the carrier control circuit 1.
Sends an autoloading signal to 5. Loading (n
In 2), the tip of the microfilm 1 in the cartridge 3 is taken out by a take-out mechanism (not shown), and the rubber roller 22 is rotated to pass between the glasses 4 and 5, and then automatically transferred to the take-up reel 6 driven by the motor M2. Wrapped around. When the winding is completed, a pulse signal is generated by the rotation of the slit disk 23 and the photosensor 24, and the pulse signal is taken into the CPU circuit 16 for data on the amount of transport of the microfilm 1. The amount of transport of the microfilm 1 from the tip end 60 to the irradiation position when winding is completed is indicated by A in FIG. 2(b).

Next, manually operate the control knob 2.
Operate 0 to feed microfilm 1 (n3)
, determine the sampling (transmitted light amount detection) position. Once the sampling position has been determined (n4), turn the control knob 20.
Conveyance of the microfilm 1 is stopped by the operation. Then, the value of the conveyance amount data displayed on the display section 19 is inputted as the position up to the start of sampling, for example, the conveyance amount Z shown in FIG. 2(b), using a switch 17 such as a numeric keypad on the keyboard 18 (n5).

Control knob 20 or keyboard 18
C by operating the upper rewind key (not shown) (n6).
The rewinding motor M1 receives a signal from the PU circuit 16, operates, rewinds the microfilm 1 into the cartridge 3, and stops when the rewinding is completed (n7).

[0024] Through this series of operations, input designation of the sampling position is completed. In FIG. 3(b), the point where the microfilm 1 is fed by the conveyance amount Z from the autoloading completion position A is the position where data sampling starts.
In reality, since there is a predetermined sampling time, area B becomes the sampling position. Area C is an area where mark counting is performed.

[0025] Then, select the frame position to search using the keyboard 1.
Input is performed using the numeric keypad 17 above 8 (n8). When a search key (not shown) on the keyboard 18 is pressed, an autoloading operation indicated by n2 is performed (n9). After feeding the microfilm 1 to the sampling position and conveyance amount Z in the memory of the CPU circuit 16 (n10), the base portion of the microfilm 1 is transferred to the base portion of the microfilm 1 within an area B indicated by a certain set sampling time x microfilm conveyance speed. The amount of transmitted light is sampled. This sampling is for light source 1
1 is transmitted through the base portion of the microfilm 1, received by the optical fiber 7, and taken into the photoelectric conversion element 10.

Based on the sampling data of the amount of light transmitted through the base of the microfilm 1, the mark counting circuit 21 and the CP
The U circuit 16 determines the slice level for mark counting. Then, mark counting for searching for image frame 5 from area C is started. In this embodiment, a plurality of optical fibers 7 are arranged at certain intervals, and marks are counted using the optical fibers 7 blocked by the counting marks 51 on the microfilm 1 (n12). Furthermore, the mark counting circuit 21 and the CPU
A circuit 16 performs mark counting. Then, at the search number frame, a stop signal is sent from the CPU circuit 16 to the carrier control circuit 15, which controls the motors M1 and M2 to stop at the search number image frame irradiation position (n14). The image on the microfilm 1 is magnified by a projection lens 8, the optical path is bent by a reflection mirror 13, and the image is projected onto a screen 14.

The searched image frame number is displayed on the display section 19 above the keyboard 18. Thereafter, a normal search operation (n16) is performed. When the search operation is completed and the rewind key (not shown) on the keyboard 18 is operated (n17), a rewind signal is issued to the carrier control circuit 15 via the CPU circuit 16, and the rewind motor M1 is driven. do. Then, the microfilm 1 is rewound into the cartridge 3, and the rewind (n18) operation is completed.

As described above, in the present invention, the sampling area B can be set at any position from the leading end 60 of the microfilm 1 by operating the keyboard 18. Therefore, 1 microfilm and 1 leader tape
' There is a density difference in the leader tape 1', or there is fog on the leader tape 1'.
Even if there is, the amount of transmitted light can be accurately sampled.

Furthermore, even if the length of the leader tape 1' is short as shown in FIG. 2(c), the splice tape S
By setting the sampling area B between the image frame 50 and the image frame 50, there is no need to perform counting correction, and accurate transmitted light amount detection and accurate counting of the counting marks 51 can be performed. Of course, as shown in FIG. 2(d), the amount of transmitted light can be sampled with respect to the ordinary microfilm 1 without any problem.

FIG. 4(a) shows a second embodiment of a microfilm retrieval device which is equipped with a light emitting/receiving sensor 60 as a counting means at a position apart from the reader illumination system. The same reference numerals in the figure are used for parts common to those in FIG. 28 is a photoelectric conversion element such as a phototransistor, 29 is a light source such as a light emitting diode or a lamp, and 30 is a slit plate having a rectangular slit 31. One set of light emitting and receiving sensors 60 is arranged at each end of the microfilm 1. You can.

The time taken for the counting mark to pass between the light emitting and receiving sensors 60 and the slit plate 2 directly connected to the roller 22
In this method, the size of the count mark is determined and counted by counting the pulses generated from the photosensor 24 due to the rotation of the count mark. The present invention can also be applied to the determination of the counting mark discrimination slice level of the photoelectric conversion element 28, since it is determined from the amount of transmitted light of the microfilm base as in the first embodiment.

FIG. 4(b) is a block diagram of a third embodiment. In the first embodiment, since the display section for searching and the display section for the amount of microfilm conveyed are both used, it is necessary to switch the display. Therefore, by providing a display section 27 dedicated to the amount of microfilm transported, display switching becomes unnecessary and operability during data input is improved.

A fourth embodiment is shown in conjunction with the block diagram of FIG. 4(b). Reference numeral 26 denotes a switch dedicated to data sampling, which feeds the microfilm 1 using the control knob 20, stops feeding the microfilm 1 before the counting mark 51, and when the sampling switch 26 is turned on, the slice level is determined at the stop position. Data sampling is performed, and normal search operations can be performed thereafter. By inputting the sampling position using the sampling switch 26, the marks on most microfilms can be counted without placing restrictions on the leader section of the microfilm 1, improving operability.

[0034]

[Effects of the Invention] As explained above, by arbitrarily setting the reference value detection position of the amount of transmitted light for detecting counting marks, it is possible to prevent the marking from occurring when the leader tape is short or when there is density unevenness or fog in the leader part. Even if there is a difference in density between the base density and the leader tape portion, the amount of transmitted light can be detected and the counting marks can be accurately and easily counted, thereby expanding the usable range of the leader tape. Furthermore, if the amount of transmitted light is detected after passing through the splice tape, it is possible to search without correcting the count of the splice portion. Furthermore, leader tapes often have scratches and dirt attached to them during autoloading, etc., which causes counting errors, but this can be removed.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a first embodiment in which the present invention is applied to a microfilm retrieval device.

FIG. 2 (a) is a block diagram showing the main circuit configuration of the first embodiment, and (b), (c), and (d) are schematic plan views of a microfilm used in the same embodiment.

FIG. 3 is a flowchart diagram showing the operation of the first embodiment.

FIG. 4 (a) is a configuration diagram showing the main parts of the second embodiment, (b)
) is a block diagram showing the main circuit configuration of the third and fourth embodiments.

FIGS. 5A, 5B, and 5C are plan views of microfilms used in conventional search devices.

[Explanation of symbols]

1 Microfilm 11 Light source 18 Keyboard (input means) 25 Measurement means 53 Counting means 60 Tip of microfilm

Claims (2)

[Claims] [Claim 1] A light source that irradiates the microfilm provided with the counting mark, detects the amount of transmitted light of the irradiated microfilm, determines a reference value of the amount of transmitted light from the detected data, and determines the amount of transmitted light corresponding to this reference value. A retrieval device comprising a counting means for counting count marks, the retrieval device further comprising an input means for setting the detection position of the amount of transmitted light to an arbitrary position from an end of the microfilm. 2. The retrieval device according to claim 1, wherein the input means sets the detection position based on a measurement value of a measurement means for measuring the amount of conveyance of the microfilm.