JPS6057579B2 - search device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a search device that searches for a desired image on a microfilm by detecting marks on the microfilm and projects the image.

When automatically searching for a desired image from a microfilm containing a large number of images, a film with signal marks provided on the side edges of the film is fed, and an optical signal from the mark is received by a photoelectric conversion element. The required image is searched by converting it into an electrical signal, counting the signal from the mark with a counter, and comparing the count of the counter with the signal of the desired image.

The microfilm used in this search method includes:
A film in which a frame mark is provided on the side edge of each image frame of the film, and a frame mark is provided on one side edge of each image frame of the film, and the other side of the first image frame of a unit of image frame group whose information content is related. There are films with markings on the edges, and these two types of microfilms are selectively used in projection devices such as microfilm readers.

Figure 1 shows two types of microfilms of the same size (16). A microfilm is shown in which each frame is provided with a different frame mark 2, and in FIG. On one side edge of the film, a frame mark 2 with a density different from that of the periphery is provided for each frame, and on the other side edge of the film (second row), a frame mark 3 with a density different from that of the periphery is placed on each frame. The microfilm provided in each case is shown. These two types of microfilm F13
F2 has the same size, but the microfilm F does not have a date mark, and image frames of a size larger than the image frames of the microfilm F are taken by the amount of the missing mark.

When retrieving desired images from these microfilms in the projection device, two mark detectors are provided to detect frame marks and subject marks/questions.

Normally, the mark detector of a projection device is located in the optical path at the level at which the film is projected, and when the film stops, it immediately projects the desired image onto a projection image such as a screen. The image on the film in the detection device is projected onto a projection surface such as a screen. Therefore, there is no problem when using microfilm F2 that has two types of marks 2 and 3, but when using microfilm F1 that has only piece mark 2,
There is a problem in that part of the image of one frame on the film F1 is not projected onto the screen due to the influence of the mark detector that detects the target mark. The present invention solves the above problems and provides a retrieval device that can always correctly project the entire image even when various microfilms are selected and used. The present invention will be explained below using specific examples shown in the drawings.

FIG. 2 shows a microfilm reader, in which the microfilm F is illuminated by an illumination system consisting of a lamp 5 and a condenser lens 6.

The image of the illuminated microfilm F is projected onto the projection lens 7.
, are projected onto a screen 9 via a mirror 8. The microfilm F is fed by a feeding mechanism (not shown) along a predetermined path in the direction of arrow a, and when a desired image is retrieved by counting the marks on the film, the desired image is placed in the projection optical path. The image is projected onto a screen. Two mark detectors 10 and 11 are arranged in one part of the projection optical path (projection position), the first detector 10 detects the frame mark 2 of the film F, and the second detector 11 detects the frame mark 2 of the film F. When the mark 3 is detected and an optical signal from the mark is received by the movement of the film, an electrical detection signal is generated. The first detector 10 is composed of a slit and a photoelectric conversion element, and is disposed on a substrate 12 having a window larger than the area of the film to be projected. The second detector 11 is composed of a slit and a photoelectric conversion element, and the substrate 12
It is arranged on a movable plate 13 which is rotatably arranged.

The movable plate 13 is connected to an operating member 15 via a lever 14, and when the operating member 15 is moved in the direction of arrow b, it rotates about a shaft 16 due to the movement of the lever 14.
Therefore, the second detector 11 moves into and out of the projection optical path according to the rotation of the movable plate 13. The photoelectric conversion element of each detector is connected to a counter (not shown) via cords 18, 19 and a connector 20, and the counter counts detection signals from the marks.

A method of retrieving a desired image by counting signals from marks is known in Japanese Patent Laid-Open No. 49-99030, so a description thereof will be omitted. In the above apparatus, when using the microfilm F2 shown in FIG. 1B, which has a frame mark and an issue mark, two detectors 10 and 11 are placed in the projection optical path as shown in FIG. 2, and the images of both detectors are and the film image are projected onto the screw 9. Therefore, the entire image of one frame of the film is projected onto the screen, and frame searches and item searches can be performed by feeding the film. Next, when using the microfilm F1 shown in FIG. 1A having only frame marks, the operating member 15 is moved to rotate the movable plate 13 and the second detector 11 is moved out of the projection optical path. Therefore, the image on the microfilm F2 is not affected by the second detector 11, the entire image of one frame is correctly projected on the screen, and frame retrieval can be performed by feeding the film. Thereafter, when using the microfilm F2 again, two types of searches can be performed simply by operating the operating member 15. Note that the mechanism for moving the second detector is not limited to the above embodiment, and other methods may also be adopted.

Also, although only one of the two detectors is made movable, it is also possible to make the two detectors movable in the same way.
With this configuration, even when using film without marks, the entire image can be correctly projected onto the screen, and it is very convenient because various films can be used in one projector. be. As described above, according to the present invention, information can be searched according to the type of microfilm, and the entire desired image can be correctly projected onto the projection surface, and these switching operations can be performed extremely easily. I can.

[Brief explanation of the drawing]

FIG. 1 is a front view of a microfilm, and FIG. 2 is a schematic diagram showing one embodiment of the apparatus of the present invention. F...Microfilm, 10,11...
... Mark detector, 15... Operation member.

Claims (1)

[Claims] 1. An optical means for projecting an image on a microfilm placed at a projection position, a first detection means for detecting a mark provided in the first row of the microfilm at the projection position, and an optical means provided in the second row of the microfilm. A retrieval device comprising: second detection means for detecting a mark at a projection position; and means for moving at least one of the detection means outside the projection position depending on the type of microfilm.