JPS6211837A - Automatic retrieving device for microfilm - Google Patents

Abstract

PURPOSE:To retrieve automatically a desired object frame even in case when a dope prism has been installed, by changing the moving direction of a stage by a signal from a prism detecting sensor for detecting whether the dope prism has been installed or not. CONSTITUTION:A projection lens 20 is held by a lens barrel 30, and also a dope prism 21 is held by a prism holder 31. The prism holder 31 is installed so as to be freely attachable and detachable, to the upper part of the barrel 30, and this installation is detected by a photosensor 33. An output of this photosensor 33 is inputted to a controller 50, and a rotating direction of pulse motors 41, 48 for the Y direction use or the X direction use is reversed through drivers 51, 52.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automatic microfilm retrieval device for projecting a sheet-like microfilm, and more specifically, to detect the attachment of a dove prism and detect the movement of the microfilm. This invention relates to a device that automatically reverses direction.

[Conventional technology]

The automatic microfilm retrieval device is provided with a stage that is movable in the X and Y directions, and a sheet-shaped microfilm (microfiche) is set on the stage. When searching for a frame, use the input key to
If you input the frame address indicating the number of frames in the X direction and Y direction from the reference frame, the control circuit will calculate the frame address of the current frame and the target frame.
Calculate the number of movement pulses in the X direction and Y direction. The obtained numbers of movement pulses in the X direction and Y direction are supplied to the X direction pulse motor and the Y direction pulse motor, respectively.
The stage is moved in two dimensions by this 2tllil pulse motor, the target frame is positioned at the projection position, and this frame is enlarged and projected onto the screen by the projection lens.

[Problem that the invention seeks to solve]

Due to the size of the original, the microfilm is
For example, there is one in which each frame of a piece of horizontal writing is recorded vertically. With this microfilm, the projected image is 9
Since the image is rotated 0 degrees, it becomes difficult to see. this is,
By reversing the surface of the microfilm, inserting a dove prism (image rotation prism) into the projection optical path, and rotating this dove prism by 45 degrees, it is possible to make the projected image's top, bottom, left and right sides correct. Become.

As mentioned above, when a dove prism is attached, the microfilm is set on the stage with a normal vehicle inspection, so the position of each frame will differ depending on whether the prism is present or not. Therefore, simply by attaching a Dove prism to a conventional device, it is not possible to automatically search for a target frame and project it onto a screen.

The present invention provides an automatic microfilm retrieval device that can always correctly search for a desired target frame by detecting whether or not a dove prism is attached and automatically changing the moving direction of the stage. The purpose is to

[Means for solving problems]

In order to solve the above problems, the present invention provides a prism detection sensor for detecting that a dove prism is attached, and when this prism detection sensor detects that a dove prism is attached, The direction of rotation of the direction pulse motor is reversed.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 2, a sheet-shaped microphone 1 and a film 11 are placed on a stage 10 that is movable in the X and Y directions.
is set and moves two-dimensionally together with the stage 10. This stage 10 includes microfilm 1
A carrier (not shown) is attached to hold the frame flat, and the frame positioned at the projection position is illuminated from below by illumination light transmitted through the stage 10. To provide this illumination, a light source 12. Heat ray cut filter 1
3. Condenser lens 14. Mirror 15. A condenser lens 16 is provided.

A projection lens 20 and a removable dove prism 21 are arranged on the stage 10. The light transmitted through the frame set at the projection position passes through the projection lens 20 and the dove prism 21, and then enters the mirror 22, where it is reflected backward and enters the mirror 23. A mirror 24 is arranged above this mirror 23,
The incident light is reflected toward a transmissive screen 25. The lighting device, mirror, etc. are housed within the case body 26.

As shown in FIG. 1, the projection lens 20 includes a lens barrel 30
The dove prism 21 is held by a prism boulder 31.

The lens barrel 30 is fixed to a lens holder 32 shown in FIG. 3, and a prism holder 31 is removably attached to the upper part of the lens barrel 30. This prism holder 3
In order to detect whether or not 1 is attached, a reflective photosensor 33 consisting of a light emitter and a light receiver is arranged.
The light reflected on the surface of the prism holder 31 is measured by the light receiving section.

When using this reflective photosensor 33, it is necessary to make the surface of the prism holder 31 a reflective surface. Note that when using a transmissive photosensor or microswitch, it is not necessary to use a reflective surface.

As shown in FIG. 3, a horizontally elongated opening (not shown) is formed in the plate 35 in the X direction with the projection position as the center, and a transparent stage 10 is mounted on the opening (not shown) so as to be movable in the Y direction. It is located. A connecting portion 36 is attached to the side of this stage 10, and a guide member 37 passes through this.

Further, this connecting portion 36 is fixed to a part of a belt 40 that is hung around a pair of booze IJs 38 and 39, and when the booze IJ 38 is driven by the Y-direction pulse motor 41, the stage 10 is attached to the guide member 37. move in a straight line in the Y direction.

A connecting portion 43 is attached to the side of the plate 35, and a guide member 44 passes through this. Further, this connecting portion 43 is fixed to a part of a belt 47 that is hung around a pair of pulleys 45 and 46, and is connected to a pulse motor 4 for the X direction.
When the boolean IJ 45 is driven in step 8, the plate 35 moves linearly in the X direction along the guide member 44 together with the stage 10.

This plate 35 has an opening extending in the X direction, and since the plate 35 moves along this opening, illumination of the frame at the projection position is not blocked.

FIG. 1 shows the main part of the present invention. The controller 50 generates drive pulses according to the moving distance in the X direction using software, and sends them to the driver 51. Along with this, the controller 50 controls rT (J and rL) indicating the rotation direction.
Send the J binary signal to the driver 51, rotate the X-direction pulse motor 48 by a predetermined amount in the +X or -X direction,
Move the stage 10. Here, when the X-direction pulse motor 48 rotates in the +X direction, the stage 10 moves in the +X direction.
When it moves in the direction and rotates in the -X direction, it moves in the =X direction. Further, the controller 50 drives the Y-direction pulse motor 41 via the driver 52, and moves the stage 10 to
Move it in the Y or -Y direction.

The Y-direction pulse motor 41 is connected to the dove prism 21.
is installed, it is necessary to reverse the rotation direction when searching. For this purpose, a changeover switch 53 having contacts a and b is provided, and is automatically switched by a signal from the prism detection sensor 33. Since an inverter 54 is connected to the contact point of this changeover switch 53, when the dove prism 21 is used, the rotation direction signal output from the controller 50 is inverted, and as a result, the Y-direction pulse motor 41 rotates. The direction is reversed. In addition, as the controller 50,
Since a microcomputer is used, when using the Dove prism 21, the pulse motor 4 for the Y direction is controlled by software.
1 can be reversed.

The keyboard 55 is provided with four movement keys 56 to 59, alphanumeric keys 60, a film loading instruction section 61, and a return key 62. The movement keys 56 to 59 are operated to adjust the position of the projected image or to manually search, and move the projected image so that a certain image is projected in the direction of the arrow. The alphanumeric keys 60 are used to input a frame address indicating which frame from the reference frame the target frame to be observed is located. In this frame address, the rows are represented by alphabets and the columns are represented by numbers. The start key is operated when starting a search. The return key is operated when setting the reference frame to the projection position.

FIG. 4 shows the film loading instruction section.

Since the dove prism 21 has the effect of reversing only the top and bottom for vehicle inspection, it is necessary to change the device ffi state of the microfilm 11 depending on whether the dove prism 21 is attached or not. Therefore, two pictures 65 and 66 showing the loaded state of the microfilm 11 and a display 67 and 68 using light emitting diodes and the like are provided. In this embodiment, the display 68 indicating "with prism" is lit, and therefore the microfilm 11 is turned face up.
It is instructed that it should be inserted from the ground direction. Note that when the display 67 is lit, the microfilm 1
You will be instructed to insert the card 1 face down and from the top.

FIG. 5 shows virtual reference points with and without a prism. Immediately after loading the microfilm 11 onto the stage 1o, the state is as shown in (A) without a prism, and as shown in (B) with a prism.
is in a state of

In order to be able to calculate the number of moving pulses in common regardless of the presence or absence of a prism, the frame address of each frame is made common and the frame address is (0).
, O) is used as the virtual reference point.

First, the frame address, even with a prism,
It is assumed that each frame is arranged in the state shown in (A). Here, in the X direction, the numerical value of the frame address of the frame on the left side becomes large, and in the Y direction, the numerical value of the frame address of the frame on the ground side becomes large. Since the reference frame A1 is located at the upper right corner without a prism, the virtual reference point is a point P that is the center of the reference frame A1. This virtual reference point P is the machine origin (
projection position) is away from 0 by the number of drive pulses ops. In addition, in the case of a prism, since the reference frame A1 is located at the lower right, the point P" which is the center of this reference frame A1 becomes the virtual reference point. These virtual reference points P, P'
The distance is DS with drive/<7 number of responses. Note that the numerical values DS and OPS are stored in the memory of the controller 50.

Next, the operation of the present invention will be explained with reference to FIG. If the dove prism 21 used in the previous search remains the same, the prism detection sensor 3
Since the light emitted from the light projecting section 3 enters the light receiving section, the prism detection sensor 33 sends a signal indicating "prism present" to the controller 50. When the controller 50 receives the "prism present" signal, it lights up the display 68. When the indicator 68 is lit, as shown in picture 66, insert the microfilm 11 face up into the carrier with the bottom side first.

In the case of a prism, the number of driving pulses is ○P' S away from the projection position O, and this OP''S is OP
It is the sum of S and DS. When the return key 62 is pressed, the controller 50 rotates the Y-direction pulse smoke 41 in the +yX direction by the number of drive pulses op's.

As a result, the reference frame A1 is positioned at the projection position 0.

Next, the controller 50 switches the changeover switch 53 to the contact position to reverse the rotation direction of the Y-direction pulse motor 41. When performing a search, it is sufficient to operate the alphanumeric keys 60 to input the frame address RF of the target frame, and then press the star key. The number of drive pulses R3 required to move this target frame to the projection position can be determined by finding out how many frames are away from the current frame and multiplying this by the number of drive pulses PS required to move one frame.
It can be calculated. At the time of the first search, the current frame is AI (0,0), so R3-(RF-AI)
It is determined by xPS. The rotation direction is determined by the positive or negative sign of the calculation result. This calculation is performed in both the X direction and the Y direction, the stage 10 moves two-dimensionally, and the target frame is positioned at the projection position.

The frame address RF of this target frame is controller 5.
0 memory and used as the frame address of the current frame during the next search. The frame positioned at the projection position O is projected by a projection lens 20° and a dove prism 21.
The image passes through mirrors 22 to 24 and reaches a transmission screen 25, where it is enlarged and projected.

For example, to search for frame C2 in FIG. 5(B), input "C2" by operating the alphanumeric keys. Even when the dove prism 21 is attached, FIG.
), the frame address is handled as if the frames are arranged as shown in Dove Prism 2.
1 is not installed. therefore,
Frame C2 is +1 frame in the X direction relative to the current frame AI,
+2 frames apart in the Y direction. Pulse motor 4 for X direction
8 moves the stage 10 by one frame in the →-X direction. Y
The direction pulse motor 41 normally rotates to move two frames in the +Y direction, but in the case of a dove prism, the direction of rotation is reversed by the inverter 54.
The stage 10 is moved two frames in the -Y direction. By the rotation of these pulse motors 41 and 48, the target frame C2
is positioned at the projection position.

If the dove prism 21 is not attached, the controller 50 drives the display 67 to turn it on. In this case, as shown in FIG. 4, the microfilm 11 is set on the stage 10 with the back side facing up. The controller 50 sets the virtual reference point to P
Therefore, when the return key 62 is pressed, the number of driving pulses OPS is supplied to the Y-direction pulse motor 41, and the stage 10 is moved in the +Y direction to move the reference frame AI located on the virtual reference point P. to the projection position.

Next, the controller 50 switches the changeover switch 53 to contact a, and sets the rotational direction of the Y-direction pulse motor 41 to the normal direction.

To search for each frame, the stage 10 is moved by calculating the number of movement pulses using the same calculation formula as in the case where the Dove prism 21 described above is attached.

If the orientation of the image recorded in each frame is normal, if the loading state of the microfilm is as shown in Figure 4 depending on the presence or absence of the Dove prism 21, the top, bottom, left and right of the projected image will be correct. become. However, if the orientation of the recorded image is different from the normal orientation, the dove prism 21 is loaded and the dove prism 21 is rotated according to the orientation of the recorded image to correct the vertical and horizontal orientation of the projected image. be able to.

〔Effect of the invention〕

The present invention having the above configuration is provided with a prism detection sensor that detects whether or not a dove prism is attached, and the direction of movement of the stage is changed based on a signal from this sensor. You can automatically search for the target frame.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing essential parts of the present invention. FIG. 2 is a schematic diagram of the apparatus of the invention. FIG. 3 is a plan view showing the stage moving mechanism. FIG. 4 is a plan view showing the film loading instruction section. FIG. 5 is an explanatory diagram showing the relationship between the presence or absence of a prism and a virtual reference point. FIG. 6 is a flowchart showing the search procedure. 10... Stage, Process 1... Microfilm 12... Light source 20... Projection lens 21... Dove prism 22 to 24... Mirror 25... Transmissive screen 41.48... Pulse motor 53... Changeover switch 60 ...Alphanumeric keys 61...Film loading instruction section 67, 68...Display body O...Projection positions p, p'...Virtual reference point A1...Reference frame.

Claims (3)

[Claims] (1) Automatic microfilm search that is equipped with an X-direction pulse motor and a Y-direction pulse motor, and moves the microfilm placed on the stage in the X and Y directions to position the target frame on the projection optical path. In the apparatus, a dove prism is detachably loaded in the projection optical path, a prism detection sensor detects whether or not the dove prism is attached, and when the prism detection sensor detects that the prism is attached, An automatic microfilm retrieval device comprising means for reversing the rotational direction of the Y-direction or X-direction motor. (2) The prism detection sensor is a photosensor consisting of a light emitting part and a light receiving part, and is configured to detect whether or not a prism is attached based on the presence or absence of reflected light from a holder holding a dove prism. An automatic microfilm retrieval device according to claim 1. (3) The automatic microfilm retrieval device according to claim 1, further comprising an instruction section that instructs the loading direction of the microfilm depending on the presence or absence of the dove prism.