JPS6247631A - Retrieving device for microfilm - Google Patents

Abstract

PURPOSE:To speed up retrieval by calculating the number of low-order marks between the low-order mark of a frame positioned currently and the low-order mark of a target frame on the basis of stored data, and controlling the feeding of the microfilm to the target frame directly. CONSTITUTION:The feeding of the microfilm 1 is controlled by detecting group marks as high-order mark formed at one edge part and frame marks as low- order mark formed at the other edge part. A group mark detection part 10 detects marks 2, a mark detection part 11 detects marks 3, and a film feed direction detection part 13 detects the forward or backward direction of the film 1. Mark detection signals S4-S7 are inputted to a counting part 14 and a memory control part 21 is stored with the numbers of frames belonging to the groups by groups. An arithmetic part 26 calculates the interval between the current frame and target retrieval frame in the form of the number of frames on the basis of the data of the memory 20 passed from a judgement part 23 and outputs it to a film driving control part 18 through a selection part 25. Thus, the retrieval is speeded up.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a microfilm retrieval device in a league printer or the like.

Search for microfilm that allows you to search for desired piece information by controlling the feed of the microfilm, which has marks corresponding to the pieces and structure the piece information using these marks.
j: Location is known.

FIG. 3 shows a block diagram of a two-level search control system consisting of pieces and items. For example, as shown in Fig. 4, this control system controls the upper mark (2) formed on one edge of the microfilm (1) and the lower mark (2) formed on the other edge. Film advance is controlled by detecting frame marks (3).

In FIG. 3, the subject mark detection 1ll (10) detects the subject mark (2) and outputs the subject mark detection signal (Sl). A piece mark detection section (11) detects a piece mark (3) and outputs a piece mark detection signal (S2). A film feed direction detection section (12) detects the front and rear feed directions of the microfilm (1) and outputs a film feed direction signal (S,). The signals (S, ), (S2) are processed logically with the film advance direction signal (S3) to produce a forward object mark signal (S, ), a rearward object mark signal (S5),
Front inner piece mark signal (S6), rear inner piece mark signal (S6)
7) is input to the counting section (14). Counting part (14
) is equipped with a piece counter that counts the piece mark (2) and a piece counter that counts the piece mark (3).
The M direction piece mark signal (S, ) is incremented by +1, and the rear inner piece mark signal (S5) is incremented by -1. Also, the case counter is +1 by the front case mark signal (S6) and at the same time the chest counter is reset, and at the same time, the case counter is incremented by the forward case mark signal (S7).
is decremented by 1 and similarly resets the piece counter.

The input register (15) holds the address of the search purpose input from the keyboard (16). Comparison section (17
) are the contents of the input register (15) and the counting section (14).
It compares the count value outputted by the controller to determine the film feeding direction, determines whether the two match, and outputs a control signal to the film drive controller (18). Based on this control signal, the film drive control section (18) starts/stops the motor that drives the film and controls rotation in forward/reverse directions.

The problem Ming is trying to solve By the way, this type of microfilm is a sequential file, and compared to a random file,
Its search speed is slow. However, as random files have become more popular, the market has come to demand that microfilm files have search speeds comparable to those of random files. The seven major actors that determine the speed of microfilm file retrieval are film advance speed and braking performance. However, the current situation is that no significant progress can be expected in these areas. Therefore, there is a strong desire to speed up searches as much as possible while maintaining the current hardware configuration.

The present inventor focused on the search operation in the return direction of the microfilm. That is, in all conventional search devices, when performing a search in the film return direction, as shown by the broken line in FIG. , the film is driven backwards and stopped at the desired force.

However, as can be seen from the movement shown by the broken line in Figure 4, the search device does not know in advance the location of the 10th Ishiu mark (2), so it has the problem of overrun. There is. Then, when detecting marks, the subject mark is detected, followed by the piece mark.

Since the detection is performed in two stages, there is a problem in that extra search time is consumed. In addition, in a three-level search, the search operation is performed in three steps, starting with the block at the top of the item, then the item, and then the piece, which causes the problem that even more search time is consumed.

Means to Overcome the Problems In view of the above-mentioned problems, the present invention aims to speed up the search using the current hardware configuration.
As a means of achieving this, a microfilm having a lower mark formed corresponding to a piece and an upper mark formed corresponding to a group of lower marks is fed and controlled by detecting the above mark. A microfilm retrieval device for searching for a desired piece includes a storage means for counting the number of lower-order marks belonging to each higher-order mark and storing the counted value when the microfilm is running, and starting the search for the desired piece. and calculation means for calculating the number of lower marks between the lower mark of the piece currently located and the lower mark of the objective power based on the data stored in the storage means, and the calculation result of the calculation means is used to calculate the number of lower marks between the lower mark of the piece currently located and the lower mark of the objective power, The basic feature is that it is configured so that the microfilm can be sent and controlled directly to the target force.

Death of a Suo Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 shows a block diagram of one embodiment. It should be noted that components having the same reference numerals as those in FIG. 4 indicate the same or equivalent components, and description thereof will be omitted.

In the figure, four types of mark detection signals (S4) + (ss
), (S6), and (S?) are input to the counting section (14), and operate the counter and piece counter (all of which are amplifier down counters) provided therein.

The memory (20) is composed of a semiconductor memory element, and stores the number of pieces belonging to a case for each case. Memory control unit (21
) centrally controls the loading of data into the memory (20) and the reading of data from the memory (20).

Data written to the memory (20) is controlled by this memory from the piece counter of the counter (14)! (21) is input. The address of the memory (20) at that time is input to this memory control unit (21) from the address pointer (22). When reading data from the memory (20), a predetermined signal is input from the determination section (23) to the memory control section (21), and the memory control section (21) generates a read address based on this signal.

The address pointer (22) to which the forward direction mark signal (S,) and backward direction mark signal are input is the address (address) at which the piece counter value is stored in the memory (20).
Manage. 1 to this address pointer (22),
For example, this amplifier is equipped with an up/down counter.
The down counter is incremented or decremented by the mark signal. For example, if the forward direction mark signal (S, ) is input to the address pointer (22) this time, the up/down counter will be set to 1 address only if the signal is in the forward direction, such as the direction mark iiη. The count value (address) is output to the memory control unit (21). By this output, the piece number data is memo'j (20
) is written to. If data has already been written to the same chick address, the stored data is updated. Furthermore, if the backward object mark signal (S, ) is input to the address pointer (22) this time, the up/down counter will be set to 1 address only if the previous object mark signal is also a backward signal. minutes will be subtracted. In this case, the count value (address) is not output to the memory control i section (21).

The memory control unit (21) has an address pointer (22)
By synchronizing the output of and the frame count value output from the counting section (14), the frame count value is stored at the count value indicated by the address pointer (22), that is, at the memory address.

Through the above operations, the address pointer (22) can always point to the current location on the memory (20) regardless of whether the film is moving or stopping.
Only the piece count value when counting forward is stored on J(20).

As shown in FIG. 2, piece count value data is stored on the memo 'j (20). Here, the Oth address refers to the initial value of the address pointer (22),
There is a value t when all the microfilms are wound onto cartridges or the like before the search is executed. 1st address: This is the 1st f-th piece number data, the 2nd address is the 2nd piece number data, and the 3rd address is the 3rd piece number data.
The piece number data of the case is stored sequentially. For example, in the example shown in Figure 2, the memory data for 1, the first item, 1, 50#, the 2nd item, 60 pieces, the 3rd item, 74 pieces, etc. (X area). , f,・7 IF'711-
When the address pointer (22) indicates the O-th address, which is the initial value, the memory The control unit (21) is a memory (20)
Clear all storage of invalid data.

The determination unit (23) receives data from the input register (15), the counting unit (14), and the memory control unit (21).
When a search request is made on the keyboard (16), the position of the search target piece (7r reply) in the input node star (15) is determined by checking the valid data heading on the memo 'J (20) through the memory control unit (21). is within the range of stored data passed through the microfilm in the past. If this retrieval target frame is not within the range of the stored data, the judgment section (23) sends a selection section (25) that selectively passes the output data of the comparison section 17) and the counter section (24). A signal is output that makes the output from the comparator (17) valid. The comparator (17) has an input renostar (
15) is compared with the output of the counting section (14) to determine the film feeding direction and whether they match. In this case, the operation is similar to that of the conventional example explained in FIG.

On the other hand, when the position of the search target piece is within the range of the memory data of the memo IJ (20), the 1-town section (23) is located within the selection section (2).
5), outputs a signal to enable the output of the counter section (24), and transfers operation control to the calculation section (26).

The arithmetic unit (26) calculates the current frame and the search target frame in frame units based on the data passed from the 1'll section (23), that is, the memory data of the number of winter crop frames shown in FIG. Calculate the distance between. The calculation result data is output to the counter section (24) with the positive and negative signs still attached.

Forward! Remark signal (S6) and backward white piece mark signal (
The counter section (24) to which S7) is input sets the data from the arithmetic section (26) as an initial value in a counter provided therein. Then, it is incremented by +1 by the front frame mark signal (S6) input as the microfilm is fed, and -1 by the rear white frame mark signal (S7). The counter section (24), like the above-mentioned comparison section (17), determines the direction in which the film is fed and determines whether to stop the film feeding based on whether the cut value is positive, negative, or O. That is, a film feed direction signal or a film drive stop signal is output to the film drive control section (18) via the selection section (25).

For example, in the example shown in Figure 2, the microfilm is currently stopped at frame f515 of the 7th movie, and
When there is a search request for the 10th frame of the work, this is a search within a certain range of stored data in memo 17 (20), so the calculation unit (26) calculates the distance between the two frames. Calculate. That is, <74-10)+120+4
Calculate 3+21+15=+263. and,
The above calculation result (+263) is stored in the counter section (24
) is stored and set. Since the sign is positive (+), the counter section (24) outputs a signal to feed the film backward. The microfilm is driven backward, and this value (+2
63) are successively decremented by -1. Then, when the value becomes 0, a film stop signal is output, and the microfilm stops. In FIG. 4, the state of film feeding is shown along with the conventional example by a solid line locus. The microfilm (1) is directly controlled to be fed from the current frame to the target frame, and there is no waste in feeding. This reduces search time.

Note that since the amount of microfilm feed is determined in advance by calculation in the calculation unit (26), acceleration, constant speed, and deceleration control in feed control can be easily performed.

To select an optimal speed pattern depending on the size of the feed amount. In particular, when approaching the target piece, a predetermined deceleration control is activated to completely stop the machine at the target without overrunning. Even in this case, if a feeding pattern that accelerates from the start of film drive to a constant speed is appropriately determined, intermediate feeding is extremely fast, leading to a reduction in search time.

In addition, the memory (20) is set with a storage area that is larger than the number of items on one microfilm (the number of blocks is 9 items at level 3), that is, a considerable margin. Normal. Therefore, before conducting an actual search, the microfilm is preliminarily run, and the number of frames for each case is recorded in the memory (20).
By doing so, it is possible to perform frame-to-frame advance control with a short search time not only in the film return direction (as in the above embodiment) but also in the film advance direction.

Further, although the control according to the embodiment shown in FIG. 1 has been described as being performed by a hardware configuration, it is not limited to this, and the same operation may be performed by program control in a microprocessor or microcomputer. can be realized.

Effects of the Invention As is clear from the above explanation, according to the present invention, the distance to the target frame to be searched for can be determined based on pre-stored frame number data, so the film can be moved directly to the target frame without unnecessary forwarding. The search speed can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a schematic explanatory diagram of a memory that stores frame number data, and FIG. f:tS4 diagram is 2
FIG. 2 is a diagram illustrating an example of a microfilm for level search and comparing film feeding of a conventional example and the present invention. 1... Microfilm, 2... Item mark (upper mark), 3... Piece mark (lower mark), 2o...
Memory, 23...flJIrfI section, 24... Counter section, 26... Arithmetic section.

Claims (1)

[Claims] (1) A microfilm having a lower mark formed corresponding to a piece and an upper mark formed corresponding to a group of lower marks is fed and controlled by detecting the above mark to achieve a purpose. In a microfilm retrieval device for searching for a piece to be searched for, a storage means for counting the number of lower-order marks belonging to each higher-order mark while the microfilm is running and storing the counted value; , calculation means for calculating the number of lower marks between the lower mark of the currently located piece and the lower mark of the target piece based on the data stored in the storage means, and the calculation result of the calculation means is used to directly calculate the number of lower marks from the current position. A microfilm retrieval device characterized in that it is configured to be able to control the feeding of microfilm to a target piece.