JPH0576622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information retrieval device that automatically retrieves desired information on an information recording medium such as a film or sheet by detecting marks on the recording medium.

Conventional search devices built into film readers, reader printers, etc. use film with search marks on the sides of each frame of the film, optically detect these marks, and count them. A desired frame in the film is automatically searched.

The above search device illuminates the mark on the film with a lamp, uses a mark detector to detect changes in the light blocked by the mark as the film is moved, and counts the output signal of this mark detector with a counter. Then, a comparator circuit compares the count of the counter with the desired frame number entered from a keyboard, etc., and when the two match, a stop signal is issued from the comparator circuit to the drive control circuit, and the drive system for transporting the film is activated. The desired frame is then stopped at a predetermined position where it is projected onto the screen. However, in the search apparatus configured in this manner, the Koehler illumination method is generally used as a method for illuminating the information recording section and the search mark recording section of the film. This illumination method uses a condenser lens to form a lamp image onto the pupil of a projection lens, and the illumination area on the film is usually the size of the image on the film in order to efficiently illuminate the entire information of one frame. It has become worthy of this. For this reason 1
When enlarging and projecting only part of the frame information onto the screen, the position of the film is moved, which may cause the search mark recording area on the film to be out of the illumination area, resulting in the illumination luminous flux of the mark recording area. If the film is moved and a search operation is performed in this state, the mark detector cannot correctly detect the search mark, resulting in an erroneous search.

The present invention aims to eliminate the drawbacks of the above-mentioned conventional examples and to enable accurate searching no matter where the information recording medium is located. When searching, a relatively wide area is illuminated to ensure mark detection, and when not searching, a relatively narrow area is illuminated to make effective use of illumination light. The information recording section is brightly illuminated.

The present invention will be explained below using specific examples shown in the drawings.

FIG. 1 shows a microfilm reader to which the present invention is applied. In the figure, 1 is a supply reel, 2 and 3 are guide rollers, 4 is an illumination device for illuminating the microfilm, 6 and 7 are glass plates placed opposite each other across the film movement path, 8 is a capstan roller, and 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 detector, 12 is a projection lens, 13
is a screen.

As shown in FIG. 2, the microfilm F has frames 15 on which image information is recorded and marks 16 attached to the side edges of each frame and having different densities from the periphery. When the film F passes between the glass plates 6 and 7, the frame portion and the mark recording portion are illuminated by light from the illumination device 4, and the image of the illuminated frame is projected onto the screen 13.

The mark detector 11 has a photoelectric conversion element, and when the mark 16 passes between the photoelectric conversion element and the illumination device 4, the light incident on the photoelectric conversion element is interrupted by the mark, so that light is emitted from the photoelectric conversion element. A pulse signal is generated. This pulse signal is sent to a counting section as a mark detection signal and counted.

FIG. 3 shows an example of the lighting device 4, with 21
is a lighting lamp, 22 is a condenser lens, 2
3 is a reflection mirror placed at 45°, 24 is a condenser lens, and 25 is an attachment lens for changing the illumination area that changes the direction of the beam of light, which can be inserted into and removed from the illumination optical path. Attachment lens 25
consists of a concave lens.

FIG. 4 shows a mechanism for moving the attachment lens 25. The lens 25 is fixed to a movable substrate 30, and the movable substrate 30 is movable in a direction across the illumination optical path. Reference numeral 31 denotes a through hole provided in the moving board 30, and is arranged in parallel with the lens 25. 32 has one end fixed to the fixed part 33',
The coil spring 33 has one end fixed to the moving board 30, and the other end is a wire fixed to a pulley 34 fixed to the rotating shaft of the motor M. The moving board 30 is the support base 3
5 and moves back and forth along its upper surface, and when the motor M is inactive, it moves to the left in the figure by the action of the coil spring 32 and is placed at the solid line position, and at this time, the through hole 31 is located in the illumination optical path between the condenser lens 22 and the reflection mirror 23. When the motor M operates and the pulley 34 rotates in the direction of the arrow, the wire 33 is wound around the pulley 34, and as a result, the movable board 30 moves rightward in FIG. 4 to the position shown by the broken line and is held at this position. be done. At this time, the attachment lens 25 is connected to the condenser lens 22 and the reflecting mirror 2.
placed in the illumination optical path between 3 and 3. Reference numerals 40 and 41 are stoppers that restrict the movement range of the movable board 30.

In the above device, when in the reader state, the film is stationary and desired information on the film is projected onto the screen 13. At this time, the motor M is inactive, the moving board 30 is placed at the solid line position in FIG. 4, and the through hole 31 is placed in the illumination optical path. Therefore, since there is no attachment lens 25 between the condenser lens 22 and the reflecting mirror 23, the light emitted from the lamp 21 takes an optical path in the area indicated by the solid line a in FIG. That is, the light from the lamp 21 is condensed by the condenser lens 22, and then reflected by the reflection mirror 23 at 90°.
The direction is changed and the light is further focused by the condenser lens 22, uniformly illuminating a narrow area of the film F (a slightly wider area than the information recording area of the film), and the filament image of the lamp 21 is formed at the pupil position of the lens 12. be done. In this state, 1 on the film
The entire frame image is projected onto the screen with appropriate brightness.

Next, when a search command is issued, the reader state changes to the search state, and the film is fed in a predetermined direction. At this time, the motor M is operated, the pulley 34 is rotated in the direction of the arrow, the movable substrate 30 is moved to the position shown by the broken line in FIG. 4, and the attachment lens 25 is placed in the illumination optical path. Therefore, the light emitted from the lamp 21 takes an optical path in the area shown by the broken line b in FIG. (a slightly wider area than the area including the mark recording area) is uniformly illuminated. (In this state,
The projected image on the screen is darker than when using the reader described above. ) Therefore, even if the film moves from a predetermined position during retrieval, the mark recording area of the film is always illuminated with approximately constant brightness, so that the mark detector 11 can be used regardless of the film position.
The amount of light when detecting the mark 16 is constant, the mark can be detected reliably, and as a result, erroneous searches can be prevented.

The details of the search device are well known in Japanese Patent Publication No. 41-260, etc., so the explanation will be omitted.

When the search operation is completed, the film feeding is stopped, the motor M is stopped, and the spring 32 is stopped.
As a result, the movable board 30 returns to the original solid line position and enters the leader state.

In the above embodiment, the attachment lens was inserted into the optical path during the search, but when the reader is used (image projection), the attachment lens is inserted into the optical path to narrow the illumination area, and during the search, the attachment lens is inserted into the optical path to narrow the illumination area. The illumination area may be widened by moving the lens out of the optical path.

Further, as a method of changing the illumination area, a configuration may be applied in which the range of the illumination area is changed by moving a condenser lens in the optical axis direction or by moving a lamp in the optical axis direction.

Furthermore, the present invention can be applied not only to film readers having a search device but also to reader printers.

As described above, in the present invention, since the illumination area of the information recording medium having a mark is changed between when searching and when not searching, the mark can be detected reliably, and the information on the information recording medium can be reliably detected. can be efficiently illuminated to project high-quality images.

[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 an explanatory diagram of the film, Fig. 3 is a configuration diagram of the illumination section, and Fig. 4 is an example of the movement mechanism of the attachment lens. FIG. 21... Lamp, 25... Attachment lens, 22, 24... Condenser lens, 30...
moving board.

Claims (1)

[Claims] 1. A transport means for transporting an information recording medium with a mark formed on the side of image information, an illumination means for illuminating the information recording medium, and an optical means for illuminating the mark on the information recording medium illuminated by the illumination means. a detection means for detecting; an optical system for projecting image information of the information recording medium illuminated by the illumination means; and, when searching for desired image information by detecting a mark with the detection means, the illumination means. An information retrieval device characterized by comprising: means for controlling to expand an illumination area.