JPS5966775A - Retrieval device - Google Patents

Abstract

PURPOSE:To detect surely a mark and to prevent mis-retrieval regardless of the recording position of the mark by using the reflected light of an auxiliary mirror to increase the light amount of the mark recorded at the side ridge of a picture part. CONSTITUTION:The auxiliary mirror 26 is located at a location outside of a picture lighting path and a part of the rays from the lamp 25 is reflected toward the mark on a film. Most rays among the rays from the lamp 25 are reflected on a mirror 14 and light up the picture part and the mark on the film through a condenser lens 15. Further, the other rays from the lamp 25 are reflected on the auxiliary mirror 26 and light up the mark through the condensor lens 15. Thus, the mark on the film is lighted with a part of the picture lighting light and lighted also with the light in addition to the picture lighting light to increase the light amount of the mark and to light the mark efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for searching for a desired image on a recording medium by detecting marks on the recording medium.

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, 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 counted contents of this counter with the desired frame number entered from the keyboard, and when the two match, a stop signal is issued from the comparator circuit to the drive control circuit, and the drive system that transports the film is stopped. The desired frame is then held still at a predetermined position where it is projected onto the screen. Normally, mark detectors have multiple photoelectric conversion elements to prevent false signals from being generated due to dust or scratches on the film, or to define the stop position of the frame, and mark the multiple photoelectric conversion elements. They are spaced apart from each other at intervals slightly shorter than the length of the film, and are arranged in parallel in the direction of movement of the film.

The ilm illumination section of such a search device is constructed as shown in FIG. 1 is the illumination rung, 2 is the condensing lens, 6
, 4 are transparent glass plates placed oppositely with the film F in between, 5
is a projection lens, and 6 is a mark detector. The light beam emitted from the lamp 1 is condensed by a condensing lens 2 and illuminates the image area and mark of the film F. The image of the lamp 1 is formed at the pupil position of the projection lens 5, thereby uniformly illuminating the image area.

The mark detector 6 detects marks by interrupting the light beam passing through the condenser lens 2 with transparent or opaque marks.

By the way, 5. Normally, the image is illuminated with the center of the illumination optical path and the center of the image aligned, and the marks are recorded on the sides of the film, so the light enters the mark part of the film obliquely. . As a result, the amount of light incident on the mark detector decreases, making it impossible to reliably detect the mark.
As a result, there was a problem in which the wrong image was searched. In particular, when using film in which marks are recorded far from the center of the image, the amount of light incident on the mark detector is extremely small, making it difficult to perform information retrieval using this film. .

In order to solve this problem, it is possible to amplify the output signal of the mark detector using an amplifier with a high amplification ratio.
It has the disadvantage of being sensitive to noise and causing malfunctions. There is a method of illuminating the image area and the mark using separate light sources, but this method has the disadvantage of being complicated and expensive.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a retrieval device that can efficiently illuminate a mark and can perform a correct retrieval regardless of the recording position of the mark.

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

FIG. 2 shows a microfilm reader to which the present invention is applied. In the figure, 11 is a supply reel;
2. 13 is a film guide roller, 14 is a reflection mirror that reflects light from a microfilm illuminating lamp,
15 is a condenser lens that condenses the light reflected by the reflection mirror 14, 16.17 is a glass plate placed oppositely across the film moving path, 18 is a capstan roller, 19 is a pinch roller, and 20 is a take-up reel. be. The supply reel 11 and the take-up reel 20 are connected to a film tensioning and winding motor.
Capstan roller 18 is connected to a film drive motor.

Microfilm F has a supply reel 11 and a take-up reel 20
The tape is stretched between them and is wound onto a take-up reel or rewound onto a supply reel by driving the capstan roller 18.

21 Ha? -1 Detection] 22 is a projection lens that forms an image of the microfilm onto a screen 26.

FIG. 6 shows a cross section of the illumination section, where 25 is a lamp for illuminating the film, 26 is placed at a position out of the image illumination optical path, and a part of the light beam emitted from the lamp 25 is directed to a mark on the film. This is an auxiliary mirror that reflects the light toward the target. Most of the light rays emitted from the lamp 25 pass through the mirror 14.
, and passes through the condensing lens 15 to illuminate the image area and mark on the film. Another part of the light beams emitted from the lamp 25 is reflected by the auxiliary mirror 26 and passes through the condenser lens 15 to illuminate the mark. Therefore, the mark on the film is illuminated by a portion of the image illumination light and also by light other than the image illumination light, so that the amount of illumination light of the mark increases and the mark is efficiently illuminated.

Size 1 position 2 of auxiliary mirror 26. By setting the angle appropriately, it is possible to make the light rays emitted perpendicular to the film surface enter the light-receiving surface of the mark detector.

In FIG. 6, by arranging the auxiliary mirror so that the ray reflected by the auxiliary mirror 26 passes through the focal point of the condenser lens, it is possible to illuminate the mark with a ray of light incident perpendicularly to the film surface.

As shown in FIG. 4, the microfilm I-Pa has a frame 65 in which an image is recorded and a mark 36 attached to the side edge of each frame which has a different density from the surrounding area. As it passes, it is illuminated by light from the lamp 250, and an image of the illuminated frame is projected onto the screen 26.

As shown in FIG. 4, the mark detector 21 includes a movable substrate 41 having an opening 40 and a guide member 42 made of an optical fiber bundle.
, 4 holes, and one end of each light guide member passes through the through hole of the first block 44 and is disposed on the side edge of the opening 40.

As shown in FIG. 5, the first block 44 is provided with a mask 50 having two apertures, and one end of each light guide member 42, 430 is fitted into each aperture of the mask.

One ends of the two original guide members 42 and 4 are arranged side by side in the film moving direction, and the distance l between the one end surfaces of both light guide members is slightly shorter than the length of the mark or the image of the mark on the film to be used. It's dark.

The other ends of the light guide members 42, 45 are inserted into through holes 451, 452 of the second block 45 on the substrate 41. As shown in FIG. 6, a filter 51 is attached to the end surface of the original guide member 42 inserted into the hole 451 of the second block 45.
is arranged, and the optical signal transmitted by the light guide member 42 passes through the filter 51 and passes through the first photoelectric conversion member 52.
Be sent to. Similarly, the other light guide parts 46 transmit optical signals to the 20th photoelectric conversion member through a filter similar to the C filter 51.The output terminal of each photoelectric conversion member is connected to the printed board 53. The filter controls the amount of light transmitted by each light guide member, corrects for differences in the amount of light transmitted due to variations in the diameter of the light guide member, and differences in the characteristics of the photoelectric conversion member, and maintains a constant amount of light incident on the light guide member. In this case, a constant output voltage is obtained from the photoelectric conversion member of each mark detector.

When the mark detector 21 is mounted on the support base 550 at a predetermined position, the printed board 56 is inserted into the connector 56 and connected to the main circuit of the apparatus. The light guide member 4 is instructed to move the film by driving the film drive motor according to the search command.
2,469 The light beam of the lamp 250 entering the light guide member 42.4 is blocked by the mark (opaque).
An optical signal is generated at each of the first and twentieth photoelectric conversion members ((((sent)) through a filter.

converted into an electrical signal. A photodiode, a phototransistor, etc. are used as the photoelectric conversion member.

In the above embodiment, the light from the mark is received by the photoelectric conversion member via the light guide member, but the light from the mark may be directly received by the photoelectric conversion member.

Further, although a plane mirror is used as the auxiliary mirror, a spherical mirror or a Fresnel mirror can also be used.

Furthermore, an auxiliary lens may be disposed in the optical path of the auxiliary mirror to further increase the amount of mark illumination light, or the auxiliary mirror may be illuminated with a light source other than the lamp 25. In this case, the capacity of the separate light source may be small.

As described above, according to the present invention, when illuminating an image area and a mark on a recording medium with a light source, it is possible to efficiently illuminate the mark recorded on the side edge of the image area by increasing the amount of illumination light. This allows the mark to be detected reliably regardless of the recording position of the mark, and erroneous searches can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the main parts of a conventional search device, Fig. 2 is a block diagram of a film reader to which the present invention is applied, Fig. 5 is a sectional view of the illumination section, and Fig. 4 is a perspective view of the mark detector. Figure 5 is m
FIG. 6 is a cross-sectional view of the first block, and FIG. 6 is a cross-sectional view of the second block. 14...Mirror 15...Condensing lens 21...Mark detector 25...Lamp foil/wath? Ma

Claims (2)

[Claims] (1) In a device that searches for a desired image by detecting a mark on a recording medium having an image and a mark provided on the side of the image, a first illumination means for illuminating the image and the mark; a second illumination means for illuminating the mark illuminated by the illumination means; (2) The search device according to claim 1, wherein the second illumination means includes a mirror that reflects the light beam generated from the first illumination means toward the mark.