JPH0122610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a film reading device that projects an image recorded on a film onto a screen.

In recent years, as the amount of information has increased, microfilms on which a large amount of image information is recorded have been widely used. There are various types of microfilm, such as roll film and fixed film, in which a large number of frames are arranged in parallel on the film.

Normally, when projecting a large number of subject manuscripts onto microfilm, one group of manuscripts related to the information content of the manuscripts is recorded on the microfilm by being reduced in size at regular intervals; therefore, one group on the microfilm The information group of (item) is arranged continuously on the film at regular intervals. For example, when a manuscript of a patent specification consisting of several pages is projected onto a roll microfilm, one patent specification is recorded on each frame in page order on the microfilm, and one group of information is recorded from multiple frames. Become. Further, documents whose information contents are not related are recorded in each frame in an arbitrary order.
When searching for desired information from the information recorded on microfilm, reading it, and copying it, it is necessary to add marks to the sides of the microfilm frames and count the marks. Therefore, known microfilm readers and microfilm reader printers with search devices configured to automatically search for desired information are used.

If the existence of the desired information is known in advance, the above device can automatically search by inputting the group number or frame number. If you are not sure whether the number is recorded or not, you cannot enter the number, so drive the drive system that feeds the film, and read the information projected on the screen while feeding the film slowly and continuously. Searches are performed by visual observation.

When performing a search while observing information such as patent specifications, it is difficult to immediately decipher and search text information that is continuously moving, albeit at a slow speed. The accompanying drawing is relatively easy to read, so I use this drawing as a clue to search for desired information. However, when observing the projected image on the screen while continuously moving the film,
Since users are always observing the entire image projected on the entire screen, their eyes move according to the movement of the image, and their eyes tend to get tired as they repeatedly scan the entire image with their eyes. Additionally, since users are usually viewed from a position close to the screen, they sometimes experience discomfort similar to seasickness, making it impossible to search for long periods of time. Especially when the screen is large, the eyes must move over a wider range, which can cause fatigue.

The present invention provides a film reading device which changes the projection magnification of the image as the film is advanced when viewing a projected image on a screen while continuously moving the film.

The present invention will be explained below with reference to the drawings.

FIG. 1 shows a microfilm reader showing one embodiment of the present invention, in which 1 is a cartridge in which microfilm is stored, 2 is a microfilm feeding motor, 3 is a feeding capstan roller, and 4 is a feeding cartridge. A pinch roller, 5 is a microfilm, 6 is a guide roller, 7 is a film guide, and 8 and 9 are mark detectors that optically detect search marks provided on the sides of the microfilm. The mark detection signal from the mark detector is counted by a counter in a known search device and used for automatic search. 10 is an illumination lamp, 11 is a condensing lens, and 12 and 13 are high-magnification lenses and low-magnification lenses having different focal lengths for enlarging and projecting a microfilm image onto a screen (not shown) 1. The lenses 12 and 13 are held on a moving table 14,
The movable table 14 is movably supported by guide rails 15. A coil spring 16 and a plunger 17 are connected to the movable base 14. When the plunger 17 is inactive, the movable base 14 is in the position shown in the figure, and at this time, the high magnification lens 12 is in the optical path for projecting the microfilm image onto the screen. placed. When the plunger 17 operates, the moving platform 1
4 is the guide rail 15 against the force of the spring 16.
The moving stage moves in the direction of arrow a along placed. Therefore, according to the operation of the plunger 17, one of the lenses is selectively placed in the projection optical path, and the projection magnification can be switched.

20 is a microfilm feeding motor, 21
2 is a brake device, 22 is a film feeding capstan roller, 23 is a pinch roller, and 24 is a film take-up reel.

The microfilm stored in the cartridge 1 is pulled out from the cartridge by a film feed motor 2, a capstan roller 3, and a pinch roller 4, and is fed to a take-up reel 24. The fed film is fed to a take-up reel 24 by a film feeding motor 20, a capstan roller 22, and a pinch roller 23. When rewinding the film, each motor is driven in reverse. The image on the microfilm located in the illumination optical path is enlarged and projected onto the screen by one of the lenses.

Fig. 2 shows the operating section for instructing film feeding and stopping, 30 is an operating knob, 31, 32
is a variable resistor for controlling the speed of the cam and motor that rotates integrally with the operating knob 30. The variable resistor 32 is connected to the circuit of the film feeding motor 20, and its resistance value changes according to the rotation of the knob 30, and the rotational speed and rotational direction of the motor 20 are changed according to the resistance value of the resistor 32. changes. 33 is a micro switch that detects whether the motor 20 is driven or stopped. The micro switch 33 is electrically connected to the plunger 17, and when the operating knob 30 is rotated to feed the film, the micro switch 33 is switched by the cam 31, and the plunger 17 is operated.

In FIG. 2, the normal operating knob 30 is in the position shown, the motor 17 is stopped, the plunger 17 is inactive, and the film is therefore stationary as shown in FIG. 3A. Then, the entire image placed at the projection position is projected onto the entire screen S at a high magnification by the high magnification lens 12. If the search number of the desired image on the film is unknown and the user wishes to search by observing the image on the screen while moving the film, the operating knob 30 is manually rotated. The cam 31 rotates as the operating knob rotates, and the micro switch 33
is switched, the plunger 17 is operated, and the low magnification lens 13 is placed in the projection optical path, while the resistance value of the resistor 32 is changed by rotation of the operating knob, and the motor 20 is rotated. Rotating the operating knob 30 clockwise causes the motor 20 to rotate forward, rotating counterclockwise causes the motor 20 to rotate in the reverse direction, and increasing the rotation angle of the operating knob increases the rotational speed of the motor 20. Therefore, by rotating the operating knob, the film is continuously fed and as shown in FIG.
As shown in , the entire image placed at the projection position is projected onto a portion of the screen S at a low magnification. Light is blocked in the area corresponding to the shaded area in FIG. 3B, and no image is projected. Identify whether the information is necessary or not while viewing the image projected on the screen at low magnification. This identification can be done by using images such as drawings whose information content can be read in a short time. If it is necessary to observe the projected image in detail, the operation knob is returned to the original stop position to stop the motor 20.
When the film stands still, the high magnification lens 12 moves to the projection position in conjunction with this, so the entire image is projected onto the screen at high magnification as shown in Figure 3A, allowing detailed observation and examination of the information content. can do. The moving speed of the film during a search can be arbitrarily adjusted using an operating knob, and when the information to be identified is simple, the moving speed of the film can be set relatively fast to shorten the search time. The projection magnification of the image projected onto the screen while the film is moving is determined by the content of the information, the speed of movement of the film, etc., and is preferably about 1/2 to 1/3 of the high magnification.

When automatic search is performed by inputting a desired information number, or when the film is intermittently fed one frame at a time, the projection may be performed at a high magnification while the film is being fed. Of course, in this case, projection may be performed at low magnification.

FIG. 4 shows another embodiment of the present invention, in which the high magnification lens 12 is always placed in the optical path and when searching by looking at the image on the screen while moving the film, it is linked to the film advance. Activate the rotary solenoid 50, and the adapter lens 51
into the projection optical path to lower the projection magnification. The solenoid 50 is connected to the micro switch 33.

As described above, since the projection magnification of the present invention is different between when the film is fed and when it is stopped, eye fatigue is reduced when viewing and searching projected images while feeding the film. This reduces seasickness and prevents the phenomenon of seasickness, allowing you to search for long periods of time without feeling any physical strain. Additionally, when the film is stopped, the entire image can be viewed in detail.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a microfilm reader to which the present invention is applied, Fig. 2 is a perspective view of the operating section that commands film feeding, and Fig. 3 A and B illustrate the state of projecting images onto the screen. FIG. 4 is a schematic configuration diagram showing another embodiment. 5...Micro film, 12...High magnification lens, 13...Low magnification lens, 20...Motor,
30...Operation knob.

Claims (1)

[Claims] 1 In a film reading device that projects an image recorded on a film onto a screen, a feeding means for feeding the film, a projection means for projecting the image at high magnification and low magnification, and commands for feeding and stopping the film are provided. and means for controlling the projection means so that the image is projected at a low magnification when the command means commands film feeding, and the image is projected at a high magnification when the command means commands to stop the film. A film reading device characterized by: