JPH03134644A - Microfilm reader - Google Patents

Abstract

PURPOSE:To completely automatically display a straightly erecting image and to improve efficiency for retrieval by providing an image rotating means to vertically invert the image to be projected on the screen. CONSTITUTION:A channel switching position detecting means 122 detects a blip 6 based on the outputs of photodetectors 70a and 70b and judges the end of a channel from the read waveform of the blip 6 itself or the output of an encoder. A CPU 102 controls motors 96 and 76 and switches the channel by a channel switching means E and an image rotation prism 26 is rotated to vertically invert the projecting image. Thus, the channel is automatically switched and the starightly erecting image always appears on a screen 14. Accordingly, efficiency for retrieval is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a microfilm reader that is capable of reading out images using a duo mode microfilm in which image information is recorded in two upper and lower channels.

(Technical Background of the Invention) As a method of photographing roll film, one side of the film is photographed sequentially one frame at a time in the length direction of the film over the 172 width of the film.
There is a duo imaging method (reciprocating imaging method) in which when one channel finishes shooting, the film is loaded and the opposite channel is shot one after the other. With conventional microfilm readers that allow selection of the Duo mode for reading microfilm imaged using this Duo operation method, film advance automatically stops when the channel to be searched ends, leaving the operator with the ability to switch channels. It was designed to force you to reorient the image. Leagues were also made to read out only one channel, with the operator loading the film in reverse each time the channel was changed.

In this way, with Duo mode microfilm, the image direction is reversed when the channels are different, so it is necessary to manually switch channels and rotate the image at the end of the channel, or to reload the film in reverse. The problem was that it was troublesome and inefficient.

(Objective of the Invention) The present invention was developed in view of the above circumstances, and it eliminates the need for operations such as rotating the image or reloading the film in reverse every time the channel is changed when reading duo mode microfilm. To provide a microfilm reader capable of automatically displaying an erected image on a screen without any need, and improving search efficiency.

(Structure of the Invention) According to the present invention, it is an object of the present invention to provide a microfilm reader capable of reading a microfilm in which image information is recorded by the duo-contrast method, including a switching position detecting means for detecting a channel switching position of the microfilm. This is achieved by a microfilm reader characterized by comprising channel switching means for switching the search channel at the switching position, and image rotation means for vertically inverting the image projected on the screen as the channel is switched.

Here, the channel switching position detecting means can be constructed by using the output of an optical sensor that detects the end of a channel, or by an arithmetic device that automatically makes a determination based on the relationship between this output and the film feed amount. Further, when channel switching is performed by inputting a channel switching signal from a keyboard or the like at an arbitrary film running position, the device itself becomes switching position detection means.

Various mechanisms are possible for the channel switching means, such as one that mechanically moves the film itself in the width direction of the film, and one that uses a prism that moves the film in the width direction of the optical axis.

The image rotation means preferably has a structure that rotates an image rotation prism interposed in the optical axis.

(Example) Fig. 1 is an overall schematic diagram of an embodiment of the present invention, Fig. 2 is a perspective view of a part thereof, Fig. 3 is a system diagram of its control signals, and Fig. 4 shows only the main parts. The conceptual diagram and FIG. 5 are diagrams showing the film.

The microfilm used in this example is the roll microfilm 2 shown in FIG. It is recorded on the right. Here is frame 4 of the upper channel and frame 4 of the lower channel.
The direction is opposite. Document marks for retrieval, that is, blips 6, corresponding to each frame 4 are imprinted on both edges of the film 2. These blips 6 identify a plurality of types by changing their positions and widths, and for example, identify file numbers, block numbers, and page numbers. This film 2 is stored in a cartridge 8 (FIGS. 1 to 3) and loaded into the league printer device 10.

The node link device 10 is configured as shown in FIG. That is, the front of the case 12 (right side in Figure 1)
A transmissive screen 14 is disposed at , on which an enlarged image of the frame 4 of the cartridge 8 is projected. The cartridge 8 is loaded into a loading section 16 located below the screen 14.

The leading end of the film 2 wound on the supply side reel 18 in this cartridge 8 is pulled out by a loading mechanism, and the six-carriage reel 1 is wound on the take-up side reel 20.
A light source 22 is arranged below between 8 and 20. The light emitted from this light source 22 passes through the film 2 and passes through the projection lens 2.
4. Image rotation prism 26, multiple reflection mirrors 28.30
．． The light is guided to the screen 14 through an optical system consisting of 32 and the like. As a result, the image information recorded on one frame 4 of the film 2 is enlarged and projected.

A mirror 34 that can be moved back and forth on the optical axis is provided between the reflecting mirrors 28 and 30, and during printing, image projection light is directed to a printer device 36 located below by this mirror 34.
For example, this printer device 36 is of the PPC type, and an electrostatic latent image of the image is formed by exposing the photosensitive drum 36a (see FIG. 3), and toner is attracted to this latent image. This process creates a visible image, which is then transferred and fixed onto printing paper. Further, this printer device 36 is
A masking device 38 is provided to block the incidence of projection light, and particularly in the case of a negative film, it blocks the incident light that would create a black border in the image.

The film advance mechanism is shown in FIG.

This film feeding mechanism is movable in the film width direction by channel switching means E, which will be described later, so that either the upper or lower channel of the film can be selectively read. When the cartridge 8 is loaded into the loading section 16, the microswitch 40 detects this, and the CPtJ 102 (described later) activates the loading mechanism. That is, cartridge 8
A roller (not shown) is brought into rolling contact with the reel 18 through an opening 8a provided at the bottom of the film 2, and the leading edge of the film 2 is drawn out and wound onto the take-up reel 20 via guide rollers 42, 44. Sensors 46 and 48 for detecting the presence or absence of the film 2 are disposed near the guide rollers 42 and 44. An endless belt 50 is pressed against the take-up reel 20 and tightly adheres to the film 2 being wound there. do. This endless belt 50 is wound around guide rollers 52, 54, 56 and a drive roller 58. The drive roller 58 is driven by a motor 60 and causes the belt 50 to run in the direction of arrow A, that is, in the winding direction. As a result, film 2 is formed by this belt 50 and reel 20.
It is wound onto the reel 20 while being sandwiched between the two. Note that the rotation shaft of the motor 62 is automatically connected to the supply reel 18 when the cartridge 8 is loaded. The film 2 is rewound by driving the reel 18 in the direction of arrow B by the motor 62. At this time as well, the belt 50 runs together with the film 2.

A tension roller 64 is pressed against the endless belt 50 with a predetermined pressure to apply appropriate tension to the belt 50.

The rotation speed of the tension roller 64 is detected by an encoder 66. Based on the output pulse signal of the encoder 66, the running amount of the endless belt 50, that is, the running amount of the film 2 is determined by the CPU 102, which will be described later.

The aforementioned grip 6 provided on the film 2 has two sets of light emitting elements 6B (68a, 68b) and light receiving elements 70 (70a, 70b). These are moved by the channel switching means E together with the film transport mechanism. Of the light emitted from the light emitting element 68, only the light passing through the grip 6 is selected by the slit 72 and guided to the light receiving element 70. The outputs of these light-receiving elements 70 are input to the CPU 102, and by integrating the type of grip 6 and the number of passes, the frame 4 that has passed under the light-receiving element 70 is identified. Since the distance between the detected position of the blip 6 and the optical axis C is constant β, the channel switching means E monitors which channel is being read, and the encoder 66
By monitoring the amount of film travel detected in , it is possible to identify the frame 4 being projected. That is, when the blip 6 of the target frame 4 is detected, if the film 2 is further sent from there by a distance β to the take-up reel 20 side or the supply knoll 18 side in accordance with the channel of the frame 4,
This target frame 4 will fall within the optical axis C.

The image information of the target frame 4 that has entered the optical axis C in this manner is projected onto the screen 14. Here, the magnification of the projection lens 24 is variable by a motor 74, and the rotation angle of the image rotating prism 26 is variable by the motor 76 (FIG. 3).

Behind the screen 14, the CCD line sensor 78 is held by a movable plate 80, and the movable plate 80 is movable left and right on guide rails 82 and 84. This movable plate 80 has a pair of pulleys 86.8 as shown in FIG.
Both ends of the wire 90 wound around the wire 8 are fixed.

The pulley 88 is rotated by a motor 92, and a wire 90 running therewith moves the movable plate 80 left and right.

Here, the channel switching means E will be explained based on FIG. 4.

In this embodiment, the film transport mechanism and the light emitting element 68 and light receiving element 70 for detecting the blip 6 are held on a common substrate 94, and this substrate 94 is located at an eccentric position of a disk 98 rotated by a motor 96. Links are connected.

Therefore, each time the motor 96 rotates the disc 98 by half a rotation from the illustrated position, the substrate 94 moves in the width direction of the film 2 by a distance of 172 times the film width. As a result, the optical axis C selectively passes through either the upper or lower channel of the film 2 and is read out.

Next, the control device 100 will be explained based on FIG. The control device 100 includes a digital arithmetic unit (hereinafter referred to as CPU) 102 and input/output interfaces (I/F) 104 and 106.
, a ROM 108 for storing operating programs, etc., and a RAM 110 for storing image signals read by the line sensor 78, various data, etc. Various signals are input to this CPU 102 via an input I/F. For example, the image signal a read by the line sensor 78, the output signals of the microswitch 40, the sensor 46, 48, the light receiving element 70, the encoder 66, etc. is input. Also keyboard 11
From 2, the identification code number of the target image or the identification code of the image to be printed is input.

Reference numeral 114 is a manual speed setting device for inputting the feeding direction and feeding speed of the film 2.

The operation knob 116 of the speed setter 114 has a tendency to return to the neutral position, and when it is rotated from the neutral position to either the left or right, the amount of rotation is input to the CPU 102. C
The PU 102 controls the feeding direction and speed of the film 2 in accordance with the direction and amount of rotation of the operation knob 116 from the neutral position.

In other words, when the operating knob 116 is in the neutral position, the film 2 is stopped; when turned to the left, the motor 60 is activated and the film 2 is moved to the left in FIG. Drive to the right.

Reference numeral 118 is an odometer that displays the distance traveled from the leading end of the film. That is, the traveling distance of the endless belt 50 traveling together with the film 2 is determined by adding and subtracting the output pulse signal of the encoder 66 by the CPU 102, and the calculation result is sent to the odometer 118.
This is what is displayed.

120 is a digital printer that prints images read by the line sensor 78 as needed, or connects the CPU 102 to another reader printer and prints images sent from other devices to this printer 120. You may also output it.

The CPU 102 also operates a channel switching position detecting means 122 shown in FIG.
Blip 6 is detected based on the output of 0, and this grip 6
Determines the end of the channel from its own read waveform. Alternatively, it may be determined that the channel has ended because the film feed amount determined from the output of the encoder 66 becomes equal to or greater than a certain feed amount after reading the grip 6.

When this channel switching position detecting means 122 detects the end of a channel, the CPU-102 sends a signal to the motor 96.74. In response to this signal, the channel switching means E switches the channel, and the image rotating prism 26 rotates to rotate the projected image upside down. As a result, channel switching is performed automatically, and an erect image is always displayed on the screen 14.

In the embodiments described above, the channel switching position is detected by the CPU 102 using the blip 6, but in a system that allows manual channel switching from the keyboard 112 or the like midway through the film, this channel switching signal input means is used to detect the channel switching position. It serves as a switching position detection means.

Furthermore, since this embodiment includes a printer device 36, the printed images are always aligned in the same orientation regardless of channel switching, and it is easy to use since there is no need to align the orientation of the images after printing.

(Effects of the Invention) As described above, the present invention detects the channel switching position when reading Duo mode film, and at the same time switches the channel, rotates the image upside down and displays it on the screen. This eliminates the need for manual channel switching and image rotation, as well as the need for reloading film in reverse. This simplifies the search process and makes it possible to search efficiently.

[Brief explanation of the drawing]

Fig. 1 is an overall schematic diagram of an embodiment of the present invention, Fig. 2 is a perspective view of a part thereof, Fig. 3 is a system diagram of its control signals, and Fig. 4 is a conceptual diagram showing only the main parts. FIG. 5 is a diagram showing a film. 2...Micro film, 1O...League printer device, 14...Screen, 26...Image rotation prism as image rotation means, 122
...Switching position detection means, E...Channel switching means.

Claims (1)

[Scope of Claims] A microfilm reader capable of reading microfilm in which image information is recorded using duo photography, comprising switching position detection means for detecting a channel switching position on the microfilm, and switching a search channel at the switching position. A microfilm reader comprising a channel switching means and an image rotation means for vertically inverting an image projected on a screen as the channel is switched.