JPH0760253B2 - Micro film camera - Google Patents

Description

The present invention relates to a microfilm photographing device.

(Prior Art) Conventionally, as a device for photographing a document such as a bill or a check in which characters and the like are written on both the front surface and the back surface on a microfilm, as shown in FIG. And a rear surface 1b of the original film 1 which is placed between the photographing lens 3 and the original 1 and is illuminated by the illumination system.
As shown in FIG. 13 (a), the front surface 1a and the back surface 1b are photographed on the microfilm 2 in a format in which the lengthwise direction of the microfilm 2 is vertically aligned and photographed on the microfilm 2.
It is proposed to provide the taking lens 3 with reflecting mirror systems 4, 5, and 6.

By the way, when the photographed microfilm is housed in a cassette, the cassette is set in a projection device (microreader), and a desired image on the microfilm is retrieved and enlarged and projected, the surface of the original 1 As shown in FIG. 13 (b), it is preferable that the microfilm 2 be photographed in a format in which the 1a and the back surface 1b are vertically arranged with the width direction of the microfilm 2 as the vertical position.

(Problems to be Solved by the Invention) However, in the photographing apparatus shown in FIG.
Even if the image is taken at an angle of 90 degrees, as shown in FIG. 13 (c), one surface (1a or 1b) is in an inverted state, and there is a problem that it is difficult to read during magnified projection.

Further, in the above apparatus, the background (black because of the dark box shape) inside the apparatus is imprinted around the image photographed on the microfilm, and a black frame is formed at the time of magnified projection, which is unsightly.

The present invention has been made in view of the above problems, and it is possible to photograph on a microfilm in a format in which the front surface and the back surface of a document are vertically arranged with the width direction of the microfilm as a vertical position. In addition to the simultaneous exposure (duplex) of both sides of the original by using the scan exposure method, the microfilm can be expanded to the area equivalent to both sides (about 2 times) (simplex). The basic purpose is to provide a device.

It is a specific object of the present invention to provide a microfilm photographing device capable of imprinting a white frame around an image photographed on a microfilm regardless of whether the photographing is performed on both sides or one side.

(Means for Solving the Problem) Therefore, according to the present invention, a photographing lens for imprinting the front surface and the rear surface of a document on a microfilm, and a photographing lens arranged between the photographing lens and the document and illuminated by an illumination system are provided. A reflection mirror system that guides the front and back light fluxes of the original to the photographing lens so that they are vertically aligned with each other in the vertical direction, an original moving mechanism that moves the original, and a front and back light flux of the moving original. A slit plate that allows a part of the original to pass through and a photographing lens moving mechanism that moves the photographing lens in synchronization with the movement of the original, and fixed white frame plates are provided on both sides in the moving direction of the original. White frame plates that can be rotated in the moving direction of the document are provided on the front and back sides, respectively, one end of the front side rotation white frame plate is aligned with the leading edge of the document, and the back side rotation white frame plate blocks the back side light flux. Is in the position When shooting both sides of the document, the rotating white frame on the back rotates in synchronization with the movement of the document, leading the leading edge of the document, and the rotating white frame on the front follows the trailing edge of the document. It is characterized in that a control circuit is provided for controlling so that the rotating white frame plate on the back side does not rotate when only the front surface is photographed.

(Operation and Effect of the Invention) According to the present invention, the front surface light flux and the back light flux of the original are aligned in the vertical direction (upright state) by the reflection mirror system, and the vertical position (format arranged vertically) is set. Since the image is guided to the photographic lens as described above, it becomes possible to photograph on the microfilm in a format in which the front surface and the back surface of the original are arranged vertically and both are upright.

Therefore, it becomes easy to read at the time of magnified projection by the projection device, and the read workability is improved.

Further, according to the present invention, the slit plate allows a part of the front light flux and the back light flux of the original moved by the original moving mechanism to pass therethrough, and the photographing lens is moved by the projection lens moving mechanism in synchronization with the movement of the original. In this way, while scanning exposure is performed on the microfilm, a fixed white frame plate provided on both sides in the moving direction of the document and a rotating white frame plate provided on the front side and the back side of the document are controlled by the control circuit. During shooting, the rotating white frame plate on the back side is rotated to lead the leading edge of the document and the rotating white frame plate on the front side is controlled to follow the trailing edge of the document in synchronization with the movement of the document. Since the rotating white frame plate on the back side is controlled so as not to rotate when shooting only the front side, the fixed white frame plate and the rotating white frame plate enable the micro film to be used for both double-sided shooting and single-sided shooting. The circumference of the image taken To be able to imprint the white frame, thereby improving viewability during magnified and projected by the projection device.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the microfilm photographing device 10
A photographing lens 3 for imprinting the front surface 1a and the rear surface 1b of the original 1 on the microfilm 2, and a surface light flux a of the original 1 which is arranged between the photographing lens 3 and the original 1 and illuminated by an illumination system L. A reflection mirror system M for guiding the back-side light flux b to the photographing lens 3 so that the back-and-forth light beam is aligned in the vertical direction, a document moving mechanism 17 for moving the document 1, and a surface light beam a for the moving document 1. Slit plate that allows a part of the back light flux b to pass
51, 52 and a photographing lens moving mechanism 53 for moving the photographing lens 3 in synchronization with the movement of the document 1 are basically configured.

As shown in FIG. 11, the microfilm photographing device 10
A case 11 having a square dark box shape is provided, and an original insertion tray 12 is provided on an upper portion of one side (left side) of the front surface of the case 11, and an original take-out tray 13 is provided on a lower portion thereof, while the other side of the front surface of the case 11 is provided. On the right side, a lid 15 for loading / unloading a cassette 14 (see FIG. 1) accommodating the unexposed microfilm 2 is provided so as to be openable / closable.

-Document Moving Mechanism- As shown in FIGS. 1 and 2, the case 1 is fed horizontally from the inserting tray 12 with the front surface 1a facing upward, and the original 1 is fed vertically, and vertically downward. A document moving mechanism 18 that forms a substantially U-shaped document feeding system path c that is bent in the direction and further bent in the horizontal forward direction in the middle and is fed to the take-out tray 13 with the back surface 1b facing upward is arranged. .

As shown in detail in FIGS. 3 and 5, the document moving mechanism 18 includes a series of document guide plates 19, ..., 19 having a gap for guiding the document 1 along the document feeding path c. ,, and drive shafts 21, ..., 20 having rubber rollers 20, ..., 20 projecting into the gaps at appropriate positions of the respective document guide plates 19 ,.
, 22 are arranged, and the driven shafts 22, ..., 22 are biased by opposing springs (not shown) toward the opposing drive shafts 21 ,. Timing belt 2 is attached to pulleys 23, ..., 23 provided at the ends of 21 ,.
4, ..., 24 are stretched, and a pulley 23 of an appropriate drive shaft 21 is provided.
A timing belt 27 is stretched between the document moving motor 25 and a pulley 26 of the document moving motor 25.

When the motor 25 rotates, the timing belt 24,
, 24 are simultaneously rotated in the document feed direction via the ..., 24, and the document 1 is guided by the document guide plates 19, ..., 19 by the feeding force of the rubber rollers 20, ..., 20. It comes to be fed at a predetermined feeding speed along the feeding path c.

-Exposure Unit (Illumination System L) -As shown in FIGS. 1 to 3, in the vertical portion of the document feeding system path c of the document moving mechanism 18, the document guide plates 19 ,.
Along with 19, transparent glass plates 30 and 31 for guiding the original 1 are arranged, and the original 1 is placed on the glass plate 30 on the right side (the back side of the case).
The front surface 1a of the document 1 faces, and the rear surface 1b of the document 1 faces the left side (front side of the case) glass plate 31.

A first illumination lamp 32 and a second illumination lamp 33 for illuminating the surface a of the original 1 are provided obliquely from below and above, respectively, facing the front glass plate 30. A third illumination lamp 34 that illuminates the back surface 1b of the document 1 from above is provided.

Each of the illumination lamps 32 to 34 has a front surface 1a and a back surface 1b even when one light is turned on for the front surface 1a and the back surface 1b of the document 1.
Are set so that they can be uniformly illuminated.

Reflecting umbrellas 32a to 34a and sockets 32b to 34b are provided for the respective illumination lamps 32 to 34, and the respective illumination lamps are also provided.
Light-shielding plate 3 that guides the illumination light of 32 to 34 to surface 1a and surface 1b
5, ..., 35 are set in place.

—Reflecting Mirror System M— Behind the rear side of the first slit plate 51, which is arranged so as to face the surface glass plate 30, is a first (second) illumination lamp 32 (3).
A first reflecting mirror 37 for reflecting the surface luminous flux a of the surface 1a of the original 1 illuminated in 3) is provided downward, and a second reflecting mirror 37 facing the first reflecting mirror 37 and reflecting the surface luminous flux a forwardly is provided. A reflection mirror 38 is provided, and a third reflection mirror 39 that faces the second reflection mirror 38 and reflects the surface light flux a obliquely laterally is provided.

Further, behind the second slit plate 52 arranged so as to face the back glass plate 31, the back side light flux b of the back side 1b of the original 1 illuminated by the third illumination lamp 34 is reflected downward. A fourth reflection mirror 40 is provided, and a fifth reflection mirror 41 is provided facing the fourth reflection mirror 40 and reflecting the back light flux b backward. A sixth reflecting mirror 42 that reflects the light obliquely to the side is disposed.

The sixth reflecting mirror 42 and the third reflecting mirror 39 are located at the same position so that the front light flux a and the back light flux b can be reflected at different heights in the vertical direction and in the same direction. Are arranged in an X-shape so that is at the upper position and the sixth reflecting mirror 42 is at the lower position (see FIG. 4).

The fourth reflection mirror 40 is arranged so that the back surface light flux b between the back surface 1b of the original 1 and the fourth reflection mirror 40 is tilted slightly downward.

A seventh reflection mirror 43 is provided to face the third reflection mirror 39 and the sixth reflection mirror 42, and to reflect the front surface light beam a in the upper part and the back surface light beam b in the lower part, respectively, obliquely rearward, Opposed to the seventh reflection mirror 43, there is disposed an eighth reflection mirror 44 which reflects the front surface light beam a in the upper part and the back surface light beam b in the lower part, respectively.

A photographic lens 3 having a process head 45 is disposed so as to face the eighth reflection mirror 44, and a cassette 14 accommodating an unexposed microfilm 2 is loaded at an image forming position of the photographic lens 3. ing.

Therefore, the surface luminous flux a of the surface 1a of the original 1 is
Reflected by the third, seventh, and eighth reflection mirrors 37, 38, 39, 43, 44,
Photographed on the micro film 2 through the taking lens 3,
The back side light flux b of the back side 1b of the document 1 is the fourth, fifth, sixth, seventh and eighth.
The taking lens 3 is reflected by the reflecting mirrors 40, 41, 42, 43, 44.
Photographed on the microfilm 2 via.

The surface luminous flux a between the original 1 and the microfilm 2
And the optical path lengths of the back surface light flux b are set to be equal.

With such an arrangement structure of the reflection mirrors 37 to 44, as is apparent from FIG. 1 showing the normal / inverted state of the image in each reflection mirror, the front surface light beam a and the back surface light beam b of the document 1 are Since the upper and lower directions are aligned (upright state) and are guided to the taking lens 3 so as to be in the upper and lower position (format arranged vertically), the front surface 1a and the back surface 1b of the document 1 are shown in FIG. 13 (b). As shown in, the format is arranged vertically,
Moreover, both can be photographed on the microfilm 2 in the upright state.

Therefore, it becomes easy to read at the time of enlarged projection by the projection device (eye color reader), and the reading workability is improved.

In the arrangement structure of each of the reflection mirrors 37 to 44 described above,
The seventh and eighth reflection mirrors 43 and 44 are omitted, and the seventh reflection mirror 43 is omitted.
Or a structure in which the taking lens 3 is arranged at the position
It is also possible to omit the reflection mirror 44 and adopt a configuration in which the taking lens 3 is arranged at the position of the eighth reflection mirror 44.

-Slit Exposure System- As shown in FIGS. 1 to 3, a first slit plate for passing a part of the surface light flux a of the document 1 between the front side glass plate 30 and the first reflection mirror 37. 51 is provided, and a second slit plate 52 that allows a part of the back side light flux b of the original 1 to pass therethrough is provided between the back side glass plate 31 and the fourth reflection mirror 40.

On the other hand, the photographing lens 3 is photographed in detail in FIGS. 6 and 7 so that the photographing lens 3 is moved from the lower side to the upper side in synchronization with the movement of the original 1 from the upper side to the lower side by the document moving mechanism 18. Instructed by the lens moving mechanism 53.

The photographing lens moving mechanism 53 includes a base 54 attached to the case 11, and a lens block 55 having the photographing lens 3 attached to the base 54 slides up and down while being pressed by pressing springs 65, 65. A screw shaft 58, which is freely supported and is rotatably supported by a bearing case 57 attached to one of the top plates 56 of the base 54, is screwed into the lens block 55, while the top plate 56 is attached. A photographing lens moving motor 59 is attached to the other of the two, and a timing belt 62 is stretched between a pulley 60 of the motor 59 and a pulley 61 of the screw shaft 58.

Then, the movement start position of the photographing lens 3 is determined by detecting the light shielding plate 64 of the lens block 55 by the photo interrupter 63 of the base 54, and when the motor 59 rotates, the screw shaft 58 is moved via the timing belt 62. When the screw shaft 58 is rotated, the lens block 55 and the taking lens 3 are moved from the lower side to the upper side by the screw shaft 58 so that the microfilm 2 is scanned and exposed.

In order to perform the scan exposure, the original 1 and the photographing lens 3
As a circuit for synchronizing the movement of the oscillator, as shown in FIG. 10 (a), the reference frequency of the oscillator 68 is set to the PLL control circuit 69,
In addition to inputting to 70, the FG (FREQUENCY GENERATOR) signal of the document moving motor 25 and the shooting lens moving motor 59 is input to the PLL control circuit 69, 70 to feedback control the rotation speed of each motor 25, 59. can do.

Further, as shown in FIG. 10 (b), the first reference frequency of the oscillator 68 is input to the PLL control circuit 69, and
The FG signal of the document moving motor 25 is input to the PLL control circuit 69 to feedback-control the rotation speed of the motor 25, while the FG signal of the document moving motor 25 is input to the PLL control circuit 70 as the second reference frequency. The FG signal of the shooting lens moving motor 59 is set to the PLL control circuit 70.
It is also possible to adopt the one in which the rotation speed of the motor 59 is feedback-controlled by inputting into the.

In this way, the front and back light fluxes a and b of the document 1 moved by the document moving mechanism 18 by the first and second slit plates 51 and 52.
Of the document 1 and the photographing lens moving mechanism 53 synchronizes with the movement of the document 1 from above to below.
Since the micro film 2 is scanned and exposed by moving the beam from the lower side to the upper side, the light fluxes a and b are thinned by the scan exposure method, so that the folding of the light fluxes a and b can be made more compact. The entire device 10 can be miniaturized, and the components such as the exposure unit (3.30 to 34) and the reflection mirror system (37 to 44) can also be miniaturized, contributing to cost reduction.

Further, the scanning exposure can be performed not only in the same direction as the feeding direction of the microfilm 2 but also in the right angle direction, and the scanning exposure can be performed with the cassette 14 and the film drive unit fixed. Scan exposure can be performed on a predetermined frame on the microfilm 2.

Further, by adopting such a scan exposure method, the original 1
In addition to shooting (duplex) both sides 1a and 1b of
Area equivalent to both sides (about 2 times) only by cutting front side 1a, back side light flux b, and extending scanning of front side 1a
It is also possible to zoom in and shoot (simplex).

-Simplex photographing system- That is, as shown in FIG. 3, a backside rotating white frame plate (shielding plate) 76 is disposed in the vicinity of the rear glass plate 31, and the rotating white frame plate 76 is provided.
Are rotated by the white frame plate rotation motor 78 to a shield position (solid line position) where the rear surface light flux b of the document 1 can be shielded and a retracted position (two-dot chain line position) where it is not shielded. The back side rotating white frame plate 76 will be described later in detail.

Further, as shown in FIG. 10 (c), while controlling the lighting of the first to third illumination lamps 32 to 34, and controlling the document moving motor 25 and the photographing lens moving motor 59, the double-sided mode is set for single-sided photographing. A control circuit 71 is provided which doubles the moving speed of the document 1 and the moving speed of the photographing lens 3 and the feed amount as compared with the case of photographing.

And, when shooting both sides (duplex), the control circuit
The back side white frame plate rotation motor 78 rotates the back side white frame plate 76 to the retracted position by 71, and only the first lighting lamp 32 among the first and second lighting lamps 32, 33 on the front side of the document 1 is moved. The third illumination lamp 34 on the back side of the original 1 is turned on (2 lights in 3 lights).

Then, the front light flux a and the back light flux b of the document 1 moved by the document moving mechanism 18 pass through the first and second slit plates 51 and 52 and are reflected by the first to eighth reflection mirrors 37 and 44. , The microlens 2 is scanned and exposed by the taking lens 3 moved by the taking lens moving mechanism 53, and both sides 1a, 1 of the document 1 are exposed.
b is shot at the same time.

Next, during single-sided shooting (simplex), the control circuit 71
Thus, the back side white frame plate rotation motor 78 rotates the back side white frame plate 76 to the shielding position, and at the same time, the first and second front side of the document 1 are rotated.
Only the proof lamps 32 and 33 are turned on (2 lights out of 3 lights).

Then, the surface luminous flux a of the document 1 which is moved at the double speed by the document moving mechanism 18 passes through the first slit plate 51, and the first to third,
7, the micro film 2 is scan-exposed by the taking lens 3 which is reflected by the eighth and eighth reflecting mirrors 37 to 39, 43, 44 and is moved at a double speed and a double amount by the taking lens moving mechanism 53, and the original 1
The surface 1a of the above is magnified about 2 times and photographed (see FIG. 13 (d)).

In this way, double-sided shooting and single-sided shooting can be selected by a simple mode switching of electrical control by the control circuit 71.

Further, during single-sided shooting, by blocking (cutting) the back side light flux b with the back side white frame plate (shielding plate) 76, the front side image can be prevented from overlapping the back side image, and only the front side image can be clearly displayed on the microfilm 2. You will be able to shoot.

Furthermore, compared with double-sided shooting, the number of illumination lamps on the front side of the original is doubled and the illuminance is doubled during single-sided shooting, but since the scan speed is doubled and the exposure time is halved, the exposure amount is reduced. Are the same and the moving speed and the feed amount of the original 1 and the photographing lens 3 are about twice, the exposure time is the same and the number of lighting lamps is 2 in 3 so that the power consumption is the same. Control can be performed reasonably.

-White frame photographing system-As shown in FIGS. 1 to 3, fixed white frame plates 74, ..., 74 are provided at both ends of the front glass plate 30 and the back glass plate 31 in the moving direction of the original 1. Are provided respectively.

Further, a front side rotating white frame plate 75 which is rotatable in the moving direction of the original 1 is arranged in the vicinity of the front glass plate 30, and a rotating direction in the moving direction of the original 1 is arranged in the vicinity of the rear glass plate 31. A back side rotating white frame plate 76 is provided.

The rotation of the rotating white frame plates 75, 76 is controlled by the white frame rotating motors 77, 78 between the position shown by the solid line and the position shown by the chain double-dashed line in FIG.

Then, first, the lower end of the front side rotating white frame plate 75 coincides with the front end of the original 1, and the rear side rotating white frame plate 76 sets the back side light flux b.
Is in a position to shield (see the solid line in FIG. 3). This position is detected by a sensor (not shown).

Therefore, the white frame plate rotation motors 77, 78 are controlled by the control circuit 79 shown in FIG. 10 (d) so that the back side rotation white frame plate 76 is synchronized with the movement of the document 1 during double-sided photography. The front side rotating white frame plate 75 is controlled so as to follow the rear end portion of the original 1 and is rotated so as to lead the front end portion of 1.
During single-sided shooting, the back side rotating white frame plate 76 is prevented from rotating, that is, is controlled so as to be stopped at the position indicated by the solid line in FIG.

Thus, the fixed white frame plates 74, ..., 74 provided on both sides of the original 1 in the moving direction, and the rotating white frame plates provided on the front side and the back side of the original 1.
By controlling 75 and 76 as described above, in the conventional case, as shown on the left side of FIG.
The background (black due to the dark box shape) inside the device was imprinted around the image captured in Fig. 8, and a black frame f (indicated by hatching) was formed during enlarged projection, which was unsightly. As shown on the right side, in both double-sided shooting and single-sided shooting, a white frame g can be imprinted around the image shot on the microfilm 2, which makes it easier to see when magnified and projected by the projection device (microreader). It will improve.

As shown in FIG. 8 (a), the rotating white frame plates 75, 76
It is also possible to omit the above and shift the exposed portions of the front surface 1a and the back surface 1b of the original 1 vertically and provide fixed white frame plates 81 and 82 behind them.

In this case, since the scanning timings of the front surface 1a and the back surface 1b of the document 1 are slightly deviated, a shutter for each of the light fluxes a and b is provided, and opening / closing control is performed at different times.

-Density Adjustment System-On the other hand, as shown in FIG. 9 (a), on the extension of the optical axis of the surface luminous flux a to the back side of the original and on the extension of the optical axis of the back luminous flux b to the front side of the original. In addition, the density plate 82,83 with moderate reflection density
May be provided respectively.

In this way, by providing the reflection density plates 82 and 83 on the extension of each optical axis of the front surface light beam a and the back surface light beam b, conventionally, the density around the image photographed on the microfilm 2 varies, Although it was unsightly when magnified and projected, in the present proposal, as shown in FIG. 9 (b), by selecting the density of each density plate 82, 83, the peripheral density of the image photographed on the microfilm 2 (see dots) That is, the visibility can be improved during enlarged projection by the projection device (micro reader).

The microfilm 2 of the present invention is mainly intended for monochrome photography, and the density adjusting plates 82 and 83 are plates (white to gray to black) having a reflectance such that the film 2 is photographed at an appropriate density during photography. An achromatic plate is usually used, and the reflectance is higher as it gets closer to white), so long as it is made of any material. When color photography is taken into consideration, a plate having a desired color and darkness on the film 2 may be used as a density adjusting plate.

With the above-mentioned configuration, the front surface 1a and the back surface 1b of the document 1 moved by the document moving mechanism 17 are illuminated by the illumination system L, and the surface light flux a
And the back-side light flux b pass through the slit plates 51, 52, are reflected by the reflection mirror system M so as to be aligned in the up-down direction, and are reflected at the up-down position, and are moved by the taking-lens moving mechanism 53.
As a result, the exposure is performed on the microfilm 2 by slit exposure.

Therefore, the front side 1a and the back side 1b of the original 1 can be photographed on the microfilm 2 in an upright state with the front side 1a and the back side 1b arranged side by side (see FIG. 13B).

Also, by switching the mode by the control circuit 71, double-sided shooting (duplex) and single-sided shooting (simplex) can be selected.

Furthermore, the rotating white frame plates 75 and 76 allow the microfilm 2
A white frame g can be imprinted on the periphery of the image photographed at, and the peripheral density of the image can be adjusted by the density adjusting plates 82 and 83.

[Brief description of drawings]

FIG. 1 is a perspective view of a microfilm photographing apparatus according to the present invention, FIG. 2 is a side view of the apparatus shown in FIG. 1, and FIG.
FIG. 4 is a plan view of FIG. 2, FIG. 5 is a perspective view of an original moving mechanism, FIG. 6 is a perspective view of a photographing lens moving mechanism, and FIG. 7 is a perspective view of FIG. FIG. 8A is a sectional view of a modified example of the white frame imprinting mechanism, and FIG. 8B is a front view of a microfilm in which a black frame and a white frame are imprinted, and FIG. FIG. 9A is a sectional view of the density adjusting mechanism, and FIG. 9B is a front view of the density-adjusted microfilm.
10 (a) and 10 (b) are respectively a synchronous control circuit diagram of the original and the photographing lens, FIG. 10 (c) is a switching control circuit diagram of double-sided photographing and single-sided photographing, and FIG. 10 (d) is White frame imprinting control circuit diagram, FIG. 11 is a perspective view of a microfilm photographing device, FIG. 12 is a perspective view of a conventional microfilm photographing device, and FIGS. 13 (a) and 13 (c) are conventional devices. The front view of the microfilm photographed in Fig. 13, and Figs. 13 (b) and 13 (d) are front views of the microfilm photographed by the device of the present invention. 1 ... Original, 1a ... Front, 1b ... Back, 2 ... Microfilm, 3 ... Shooting lens, 10 ... Microfilm photographing device, 11 ... Case, 14 ... Cassette, 17 ... Move original Mechanism, 19 ... Original guide plate, 22 ... Original movement motor, 30, 31 ... Glass plate, 32-34 ... Illumination lamp, 37-34 ... Reflecting mirror, 51, 52 ... Slit plate, 53 ... … Shooting lens moving mechanism, 89 …… Shooting lens moving motor, 71,79 …… Control circuit, 74 …… Fixed white frame plate, 75,76 …… Rotating white frame plate, 77,78 …… White frame plate rotation motor , 82, 83: Density adjusting plate, a: Front surface light flux, b: Back surface light flux, c: Original feeding system path.

Claims (1)

[Claims] 1. A photographing lens for imprinting a front surface and a back surface of a document on a microfilm, and a front light flux and a back light flux of a document which are arranged between the photographing lens and the document and which are illuminated by an illumination system. A reflection mirror system that guides the photographing lens so that the top and bottom directions are aligned so as to be in a vertical position, a document moving mechanism that moves the document, a slit plate that allows a part of the front light flux and the back light flux of the moving document to pass through, Equipped with a shooting lens moving mechanism that moves the shooting lens in synchronization with the movement of the original, fixed white frame plates are provided on both sides of the original moving direction, and the original and front sides of the original rotate in the moving direction of the original. Possible white frame plates are provided respectively, one end of the front rotary white frame plate is aligned with the leading edge of the document, and the back rotary white frame plate is at a position to shield the back side light flux.
In synchronization with the movement of the document, the rotating white frame plate on the back side rotates so as to lead the leading edge of the document, and the rotating white frame plate on the front side controls so as to follow the trailing edge of the document. A microfilm photographing device, which is provided with a control circuit for controlling the rotating white frame plate on the back side not to rotate during photographing.