JPS59105628A - Information reading device - Google Patents

Abstract

PURPOSE:To prevent a recording medium from making useless movement and being erroneously retrieved, by constituting an information reading device in such a way that a reading means is installed in freely attachably and detachably to the main body of the device and the mounted condition of the reading means is detected and the information reading by means of the reading means is stopped by the detected signal. CONSTITUTION:A mask reader 11 contains a movable substrate 21 having a port 20 and photoelectric conversion elements 25, 26, and 27, and each element 25-27 is held at the side edge of the port 20 by means of a block 28. In front of the block 28 facing to a film moving path, a mask 29 having three apertures 291-293 is installed and each aperture of the mask 29 faces to the light receiving surface of each photoelectric conversion element 25-27. An input device 45 which inputs information for retrieval has numeral keys, through which the retrieving item of desired information to be retrieved, namely, a frame No. is inputted. A retrieval controlling circuit 46 is equipped with a counting section which counts signals outputted from an AND gate A4 and a comparing section which compares the counted value of the counting section with a frame No. inputted into the input device 45 and, when both of them coincide with each other, outputs a coincidence signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information reading device for reading information on a recording medium.

The present invention can be applied to a device that reads information such as code marks recorded on a recording medium, and an example will be described below in which information is retrieved by reading marks recorded on a microfilm.

Conventionally, the film used in search devices built into microfilm readers and the like has a counting mark on the side edge of each frame of the film, and by detecting this mark, the desired frame on the film can be found. It is set to search automatically.

The above search device illuminates the mark on the film with a lamp,
When moving the film, the light flux from the mark is read by a mark reader having a photoelectric conversion element, the output signal of the photoelectric conversion element is counted by a counter, and the count contents of this counter and the undesired frame number input from the keyboard are recorded. When the two match, a stop signal is sent from the comparison circuit to the drive control circuit, which stops the drive system that transports the film and brings the desired frame to a fixed position where it will be projected onto the screen. It is designed to let you do so. Normally, mark readers have multiple photoelectric conversion elements to prevent false signals from being generated due to dust or scratches on the fillet, or to define the stop position of the frame. The marks are spaced apart at intervals slightly shorter than the length of the mark, and are arranged side by side in the direction of movement of the film.

However, with a search device configured in this way, there is no problem as long as the shape of the mark on the film is constant, but since the shape of the mark is not standardized, the shape of the mark on the film that is commonly used varies. Therefore, only films with marks of a certain length can be used in one retrieval device, and when films with marks of different lengths are used, There are problems where the frame stop position deviates from the predetermined position and the frame search cannot be performed correctly. To solve this problem, it is possible to install multiple search devices depending on the type of film, or to adjust the mark reader to change the spacing between the photoelectric conversion elements, but the former method would be expensive. It is very expensive because it requires a large number of search devices, and according to the latter, if the marks are closely spaced, multiple photoelectric conversion elements will detect different marks (adjacent marks) at the same time, resulting in erroneous searches. There is a pentacle.

In order to solve these problems, prepare a number of mark readers corresponding to the types of marks on the film, select the mark reader corresponding to the type of mark, and place the selected mark reader at a predetermined position on the main body of the device. There is a known method of searching for information by attaching the device to the device.

However, with this method, there is a problem that a search start is commanded even when the mark reader is not installed, and the film is unnecessarily fed to the end, or incorrect information is retrieved due to a mark reader not being installed properly. Ta.

The present invention solves these problems and provides an information reading device that can prevent unnecessary movement of recording media, erroneous searches, and the like.

The details of the present invention will be described below with reference to the drawings.

FIG. 1 shows a microfilm reader to which the present invention is applied. In the figure, 1 is a supply reel, 2,
3 is a guide roller, 4 is a lamp that illuminates the microfilm, 5 is a condensing lens, 6 and 7 are glass plates placed opposite each other across the film movement path, 8 is a capstan roller, 9
1 is a pinch roller, and 10 is a take-up reel. The supply reel 1 and take-up reel 10 are connected to a film tensioning and winding motor, and the capstan roller 8 is connected to a film drive motor.

The microfilm F is stretched between the supply reel 1 and the take-up reel 10, and is wound onto the take-up reel or rewound onto the supply reel by driving the capstan roller 8.

11 is a mark reader, 12 is a projection lens, and 13 is a screen. As shown in FIG. 2, the microfilm F has a frame 15 in which an image is recorded and a mark 16 attached to the side line of each frame, which has a different density from the periphery. At this time, the sesame seeds are illuminated by the light of the lamp 4, and an image of the illuminated sesame seeds is projected onto the screen 13.

As shown in FIG. 2, the mark reader 11 has a movable substrate 21 having an opening 20 and photoelectric conversion elements 25° 26.27, and each photoelectric conversion element has a block 28 on the side edge of the opening 20.
is held by.

As shown in FIG. 4, there are three apertures 29+, 29 on the front surface of the block 28 facing the film movement path.
A mask 29 having a diameter of 2.2, 29g is disposed, and each aperture of this mask is disposed opposite to the light receiving surface of each photoelectric conversion element 25°26.27.

The three photoelectric conversion elements 25, 26.27 are arranged side by side in the moving direction of the film, and the photoelectric conversion element 25.2 on the amphoteric side
The length l between the light receiving surfaces of 7 is the mark 16 on the film used.
Alternatively, the marks are spaced apart from each other so as to be slightly shorter than the length of the mark image.

Further, the mark reader has pulse signal output terminals 351, 352, 35s, 3 connected to the photoelectric conversion elements 25, 26, 27 by electric cords 30, 31° 32.
5e and code signal output terminals 357.35g and 35s+ which are not connected to the photoelectric conversion element, and terminal 3
58 and 359 are electrically connected. Terminal 35 is not connected to terminals 35g and 35o. This mark reader is configured to be detachably attached to a support base 36 provided on the main body of the apparatus. A connector 37 having terminals that electrically connects with each terminal on the board when the mark reader 11 is mounted at a predetermined position on the support base 36 is provided on the main body of the apparatus. This connector corresponds to each terminal of the board 21 and has the same number of terminals as the terminals of the board, and these terminals are connected to a control circuit of a search device to be described later. When the mark reader is attached to a predetermined position and the film is moved, the light beam of the lamp 4 that enters the photoelectric conversion element is interrupted by the mark, so that the amount of light that enters the element changes, and each photoelectric conversion element 25
, 26. A pulse signal is output from 27.

FIG. 5 shows a microfilm used in the mark reader 11. Marks 16 are provided on the sides of each frame of the microfilm F, the density of which differs from the surrounding area.
has a size that simultaneously covers the light receiving surfaces of the three photoelectric conversion elements 25, 26, and 27. When the relative positional relationship between the mark 16 and the photoelectric conversion elements 25, 26, and 27 reaches the state shown in FIG. 5, each photoelectric conversion element outputs a high-level pulse signal.

Figure 3 shows a mark reader that is applied when using a microfilm different from the microfilm shown in Figure 5. Items with the same configuration and functions as those in Figure 2 are designated by the same reference numerals. be. The mark reader 111 shown in FIG. 3 is different from the mark reader 11 shown in FIG. However, the terminal 35g is not electrically connected to the terminals 357 and 3507.

FIG. 6 shows a microfilm used in the mark reader 111.A mark 16' is provided on the side of each frame of the microfilm F', and the density is different from the surrounding area.The mark 16' is a mark on the film F. It has a shorter length in the film movement direction than 16, and has a size that makes it impossible to simultaneously cover the light receiving surfaces of the remaining photoelectric conversion elements 27 when the light receiving surfaces of the photoelectric conversion elements 25 and 26 are covered at the same time.

FIG. 7 shows an example of a search circuit, in which the mark reader 1
1 is attached to a predetermined position on the support base 3G, each terminal 35.・・・・・・35° is broken'MU a
It is electrically coupled to each terminal of the connector 37 of the search circuit at the position. That is, terminals 35° and 352 are connected to the amplifier 40.
, terminals 353 and 354 are connected to amplifier 41 tL, terminals 35 . and 356 are connected to the amplifier 42.

Also, terminal 35. is the terminal 37. of the connector 37 connected to the power supply +V via the resistor RZ. is connected to terminal 3.
5. is the terminal 37. of the connector 37 connected to the power supply +■ via the resistor R2. The terminal 359 is connected to the terminal 373 of the connector 37 which is connected to the ground G. When the mark reader 11 is installed in a predetermined position, the terminal 372 of the connector 37 is connected to the ground G. A1/A2...A8 are AND gates, G1/G2 are OR gates, Vl/F2 are inverters,
Reference numerals Fl and F2 are flip-flops. Reference numeral 45 is an input device for inputting search information, and has numeric keys and the like for inputting search items of desired information to be searched, that is, frame numbers.

Reference numeral 46 denotes a search control circuit, which includes a counter that counts the signals output from A4, a count value of the counter, and an input device 4.
Since the frame details input in step 5 are well known, their explanation will be omitted. The search control circuit 46 outputs a high-level start signal from the output terminal 46a when the input device 45 commands the start of the search, and when the two values compared in the comparison section match, the search control circuit 46 outputs a high-level start signal from the output terminal 46a.
A high level coincidence signal is output from b. 47 and 48 are display devices, and 49 is a motor drive circuit that controls a film drive motor that drives the capstan roller 8.

Next, the operation of the search device will be explained. Before starting the search operation, the flip-flops F1 and F2 are reset.0 In order to perform the search using the microfilm F, the mark reader 11 is attached to a predetermined position, and the frame number of the desired frame is input to the input device 45. When you enter and command to start searching,
A start signal is output from the output terminal 46a of the search control circuit 46, and this signal opens the anti-game) A6.
Then, the flip 70 knob F1 is set. A motor drive signal is output from the Q output terminal by setting the flip-flop F1, and this signal drives the film drive motor via the motor drive circuit 49. This causes the capstan roller 8 to rotate in a predetermined direction, and the film F is transported in a predetermined direction. As the film is transferred, pulse signals are sequentially output from the photoelectric conversion elements 25, 26, and 27. When the photoelectric conversion elements 25 and 26 simultaneously output pulse signals (when the photoelectric conversion elements 25 and 26 simultaneously detect the mark 16), the AI opens and the photoelectric conversion element 2
When 6 and 27 simultaneously output pulse signals, AND gate A2 opens. Therefore, photoelectric conversion elements 25, 26, 2
7 outputs a pulse signal at the same time Antogame) A4
is opened, and at this time, the signals outputted from the AND gate A 4 >:s are sent to the search control circuit 46 as a mark detection signal, and are counted by addition or subtraction in the counting section. The counting section is switched to an addition or subtraction state depending on the film transport direction. As the film is transported, the count value of the counter changes, and when the frame number input to the input device 45 and the count value of the counter match, a match signal is output from the output terminal 46b. This coincidence signal resets the flip-flop F1, so that the motor drive signal is no longer output, the film drive motor is stopped, and a brake device (not shown) is activated to immediately stop the film. When the film stops, the mark of the desired frame and the photoelectric conversion elements 25, 26, 27
The relative positional relationship with is shown in FIG. 5 and the following state is reached. When the film stops, the desired frame is placed in position to be projected onto the screen.

In the above explanation, the mark reader 11 is correctly attached to the predetermined position, but the mark reader 11 is not attached, or the mark reader 11 is improperly attached such that the terminals of the mark reader 11 are not connected to the terminals of the connector 37. When a search operation is performed, the AND gate A5 is opened because the terminals 372 and 373 of the connector 37 are not connected, and a high-level abnormality detection signal is output from the AND gate A5. At this time, even if the start signal is output from the output terminal 46a of the search control circuit 46, the output of the inverter V2 is at a low level, so the start gate 6 does not open, and the flip-flop F1 is in the reset state and the film drive motor is activated. It does not drive, the film remains in a stopped state, and no search operation is performed. In other words, the mark is not read. On the other hand, the ant game A8 opens in response to an abnormality detection signal output from the ant game A5, and the display device 48 lights up to indicate that there has been an operation error (incorrect attachment of the mark reader).

Thereafter, when the mark reader 11 is correctly attached to a predetermined position, the display device 48 disappears and the search becomes possible.

In addition, if the mark reader 11 is incorrectly removed from the predetermined position while performing a search operation with the mark reader 11 correctly attached to the predetermined position, or if a contact failure occurs between the mark reader 11 and the connector. In case of Antogame) A5
Outputs an abnormality detection signal from the
) A7 opens, thereby setting the flip 70 knob F2. By setting the flip 70 tab F2, the display device 47 lights up, clearly indicating to the operator that there is an abnormality in the device. On the other hand, the flip-flop F1 is reset via the OR gate G2 by setting the 7-lip flop F2, and thereby the film drive motor is stopped and the mark is no longer read.

As described above, when the mark reader is not attached to the predetermined position, reading of the mark is stopped, thereby eliminating unnecessary search operations and searching for incorrect information.

FIG. 8 shows the mark reader 111 shown in FIG.
The terminals 357 and 35o of the mark reader 111 are electrically connected, so the terminals 37. is connected to ground G.

When performing a search using the microfilm F' shown in FIG. 6, the mark reader 111 is attached to a predetermined position.

When the frame number of the desired information to be searched is input into the input device 45 and a search start is commanded, the film is transferred in a predetermined direction, and the photoelectric conversion elements 25 and 26 simultaneously output pulse signals while the film is being transferred. , and when the photoelectric conversion element 27 does not output a pulse signal, the AND gate A4 opens and a mark detection signal is output from the AND gate A4. This mark detection signal is counted by a counting section of the search control circuit 46. The subsequent operations are the same as described above, so the explanation will be omitted. When the desired information is retrieved and the film F' is stopped, the relative positional relationship between the mark 16' of the desired frame and the photoelectric conversion elements 25, 26, and 27 is as shown in FIG. Furthermore, the stopping position of the desired frame at the end of the search is constant regardless of the direction in which the film is transported, and the entire desired information can be projected onto the screen and observed at the same time as the search ends. It can be applied not only to reading but also to reading other information. Furthermore, the mechanism for removably connecting the reader to the main body of the device is not limited to the embodiment.
Any known coupling mechanism can be employed. Moreover, the installation failure may be clearly indicated by a sound using a buzzer or the like instead of by lighting the display device.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a film reader to which the present invention is applied, Fig. 2 is a perspective view of a mark reader, Fig. 3 is a perspective view of another mark reader, and Fig. 4 is a mark reading of Fig. 3. Figures 5 and 6 are diagrams explaining the microfilm, Figure 7 is a block diagram of the retrieval circuit, and Figure 8 shows the retrieval circuit of Figure 7 combined with the mark reader of Figure 3. Shows the connected diagram.

Claims (1)

[Claims] An information reading device characterized in that the information reading device is configured to stop reading information by a reading/reading means for reading information on a moving recording medium.