JPS5888737A - Micro camera reader - Google Patents

Abstract

PURPOSE:To obtain a micro camera reader which projects a sharp image by recording a noise-free image during photographing without causing discharge, and preventing a film from curling during projection. CONSTITUTION:During photographing, pressure glass 17 leaves the photosensitive surface of a film 13, whose desired unexposed part is charged by a charger 23 and moved to a photographic position. Then, a reflected image from an original 11' is recorded through a photographic lens 12 to form an electrostatic latent image. The latent image is developed by a developing device 24 to obtain a toner image, which is fixed by a heater 25. To view the image on the film 13 after the fixation, the film 13 is moved to between a heat-absorbing filter 15 and the pressure glass 17 and sandwiched wherein, and a lamp 16 is turned on to project the image on a screen 11. During the projection, the pressure glass plate 17 is pressed against the film to hold the film flat, so a noise-free image of excellent quality is obtained to project a sharp image.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a micro camera reader that is equipped with a recording section for recording in a photographic manner and a projection section for projecting a recorded image on a microfilm.

Microfilm recording devices (hereinafter referred to as microcameras), which capture and record images of original documents on microfilm, and microreaders, which project images recorded on microfilm, are both well known and widely used. .

However, these are separate devices, and no combination of the two is known.

This is because the camera requires a photographic lens, and the reader requires a projection lens and screen with different specifications from the photographic lens, and there are few parts that can be shared optically, and the use of microfilm. The photosensitive materials used are generally silver halide photographic films or diazo films, which require a long processing time and processing space when developing the photographed film. The reason for this is thought to be that K naturally has to be separated because of the development process.

Here, a system that integrates a camera and a reader using a microfilm material made of silver halide photographic film or diazo film is used, for example, to sequentially photograph and record a plurality of frames on unphotographed portions of a continuous film. In principle, it is possible to create a system in which the frames recorded together are projected and the remaining unphotographed portions are photographed at a later date. However, when using ordinary silver halide photographic film or diazo film as microfilm, if recorded frames and unphotographed parts coexist, the source of the high-intensity light source used to project the recorded frames may be It is very difficult to prevent capri from entering the unphotographed areas and eliminate the occurrence of capri, and it is also necessary to change the film while leaving the unphotographed areas, so the long process described above is necessary. In addition to requiring time and processing space, a new technical problem arises in that the unexposed parts of the film must be completely shielded from light1. In the electrophotographic method, the photosensitive material is substantially photosensitized until it is charged, and furthermore, the effect of exposure performed before development can be erased by known physical methods. We have found that this method is extremely suitable for systems such as.

Therefore, the present inventors adopted electrophotography as a method of photographing on microfilm, and it is possible to take photographs on a long microfilm, for example, by skipping intervals for each theme, and to take additional photographs at a later date on the unrecorded parts. As a result, they devised a system that required microfilm to be transported back and forth between the imaging section and the projection section.

This system randomly records many different types of information one after another, depending on needs. 3- If you want to extract information by category all at once, or if you want to search and project by type when projecting (playing) Useful in some cases.

In this system, for example, when performing additional shooting on the unshot portion of a partially shot film, when projecting the previously shot film to confirm the type of film and the position of the shooting frames, 2. When modifying or adding data that has already been photographed; 3. When photographing important documents or originals that require changing the photographing conditions (or when it is necessary to monitor the recorded images after recording them; Since recording (photography) and playback (projection) are frequently repeated in applications such as
Preferably, it is integrated into one device.

Therefore, a photographic stage for photographing and a screen for projection are installed together in one device, and one of the film feeding means [J: He invented and filed an application for a micro camera reader that enables projection. (Japanese Patent Application No. 56-97663) In this system, a transparent support plate is used as a photographing stand on which an original is placed and suspended, a light diffusing plate is used as a projection screen, and a photographing lens and a projection lens are placed on the photographing stand and the projection screen respectively. The microfilm is attached to the screen and sent to the shooting position and the projection position on the optical axis of these lenses, and the microfilm is made of electrophotographic material and at least A charger is installed to uniformly charge the area corresponding to one frame, a developing device is installed after the shooting position to develop the electrostatic latent image formed by exposure, and then a heater for fixing is installed. It is something that is arranged.

However, the micro camera reader described above has the following problems because it uses the same device to perform imaging and projection.

In other words, when two sets of optical systems are used to configure one for photographing and one for projection separately, the optical systems such as lenses and mirrors are required twice, which is disadvantageous in terms of cost and size of the device. This poses a huge problem in practical terms. In addition, when using the same optical system for both photography and projection, it is recommended to hold the film with a glass crimp plate like that used for projection in order to maintain the flatness of the film during photography. When the plates come into contact, a discharge is generated in the image area,
There is a problem in that it is difficult to prevent noise from being generated due to discharge. In particular, since the recorded images are extremely small because they are recorded on microfilm, the noise caused by the discharge greatly impairs the image information, which is a big problem in practice. However, if the photosensitive side of the film is held completely free to avoid contact with the glass pressure bonding plate, the discharge problem will be resolved, but the shadow image will become out of focus due to the heat from the projection light source during projection. There is a problem with this.

In view of this, the present invention has been developed as a micro camera reader that can record images without causing discharge (and noise) during shooting, and prevent film curl during projection to project sharp images. The purpose is to provide the following.

The micro camera reader of the present invention performs photographing and projection at the same position, and when photographing, the photosensitive surface pressure bonding glass is separated from the photosensitive surface of the film, the film is held while maintaining flatness, and the film is pressed onto the charged photosensitive surface of the film. VC (,,, during projection, pressure bonding glass is pressed onto the photosensitive surface of the film to maintain the flatness of the film.As a method for maintaining the flatness of the film, , for example, by suspending the film between two sets of film feed rolls and applying tension to the film to make it flat, or by inserting the film from the side of the film holding glass (in contact with the support surface of the film). A method of bringing the film into close contact with the holding glass by suction can be adopted.

Since the film is not exposed to high-temperature light source light during photographing, the flatness of the film can be maintained by applying the above-mentioned tension, or by supporting only one side flat and maintaining the flatness by suction.

To attach and detach the above pressure-bonded glass to the film surface, use a projection lamp,
It is desirable to perform this automatically by operating in conjunction with turning on and off a lamp for illuminating the document.

It goes without saying that the term "micro camera reader" in the present invention includes a micro camera reader printer.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

The drawing shows an example of a micro camera reader with an overhead photographing stage and a projection screen.

A document 11' is placed on top of the document 11' and micro-photographing is performed. Immediately above this diffusion screen 11, a photographing/projecting lens 12 is arranged, and a reflected image of a microfilm 131'j document sent thereon with its photosensitive surface facing down is formed. Two lighting lamps 1 are installed diagonally above the diffusion screen 11.
4 is placed.

A microfilm 13 is placed on the diffusion screen 11 from above.
A lens 16 is placed on the photographing and projecting lens 12 to capture the image. This heat shielding filter 15 is attached to the back side (support side) of the film 13.
In contact with the film] 3, the flatness of the film is maintained. Further, on the lower side of the film 13, a photosensitive surface pressing glass 17 for pressing the film 13 onto the heat-insulating filter 1g is provided so as to be able to contact or not contact the film 13. This pressure bonding glass 17 is for pressure bonding the film 13 onto the heat insulating filter 15 during projection. This can be done for quite a long time (
This is to prevent the film from being deformed or deteriorated by the heat even if it is exposed to a light source (for example, for several tens of minutes).

While the microfilm 13 is being sent from the delivery roll 21 to the take-up roll 22, a charger 23 and a photographic lens 1
2. These means are arranged so that the image passes through the developing device 24 and the fixing heater 25 in this order. This microfilm 13 is preferably stored in a cassette C (such as a moving picture film for 8Ryu and 16MY), and by loading the cassette into the film loading position in the housing, as shown in the figure, the microfilm 13 is charged and charged. Exposure and development processes Microfilm 13vc The method of recording using electrophotography has been known for a long time, so a detailed explanation will be omitted, but the point is that the unphotographed portion of the microfilm is small (in one frame). All that is required is to uniformly charge the corresponding portion (the portion exposed by photographing) and apply the developer.

Next, the function and usage of the camera reader shown in the drawings will be described.

Due to the action of a film feed control device (not shown) that controls the feeding of the microfilm 13, the feed shaft 21a of the feed roll 21 or the winding shaft 2 of the winding roll 22
2a is driven to feed the microfilm 11 to a desired position. At the time of photographing, the pressure bonding glass 17 is separated from the photosensitive surface of the film 13, and after a desired blank area (unphotographed area) of the microfilm 13 is charged with the charger 23, the photographing position (
position of the photographing/projection lens 12), and here
11- A reflected image of the original 11' illuminated by the illumination lamp 14 is recorded by the photographing/projecting lens 12, forming an electrostatic latent image. Next, the electrostatic latent image is developed into a toner image by a developing device 24 at a developing position adjacent to the photographing position, and then moved to a fixing position where the toner image is fixed by heat from a heater 25. [Microfilm after fixing] If you want to see the image above, remove the film 13 from the heat shield filter 15.
The film 13 is moved between the holder and the pressure bonding glass 17, and the film 13 is held between the two, the lamp 16 is turned on, and the film is projected onto the projection screen 11 for viewing. Note that fixing may be performed using the lamp 16 as a heat source instead of the above-mentioned I/heater 5. In this case, after developing one frame, the heat-insulating filter Akira 15
All you have to do is remove the lamp and turn on the lamp 16.

In the second embodiment, the photographing table is of a table type, and the photographing lens, film advance mechanism, etc. are arranged above the photographing table, but this is a desktop type, and the photographing lens, film advance mechanism, etc. are arranged above the photographing table. A lume feeding mechanism (2 is also possible).

In the above embodiment, the press-bonded glass plate 17 that is press-bonded to the photosensitive surface of the film 13 during projection is press-bonded in response to the lighting of the projection lamp 16, and moves away from the film 13 in response to the lighting of the illumination lamp 14. It is desirable that the

The micro camera reader of the present invention has a projection screen as well as a photographing stage for placing an original, so it can perform both photographing and projection with one device. The device is compact.Also, during shooting, the pressure-bonded glass plate is separated from the photosensitive surface of the film to prevent noise caused by electrical discharge, while during projection, the pressure-bonded glass plate is pressed to the film, reducing the flatness of the film. is maintained, making it possible to obtain good image quality without noise and project sharp images.

[Brief explanation of drawings]

The drawing is a schematic side sectional view showing one embodiment of the present invention. 10...Housing 1]...Photography stand and projection diffusion screen 12...Photography and projection lens 13...Micro film 1
4...Lamp for lighting 15...Heatproof filter 1
7. Crimp glass plate 23. Charger 24...
Developing device 25... Fixing heater 15
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Claims (1)

[Claims] 1) Microfilm of electrophotographic light-sensitive material --3--
-1 At the same time as recording an image, the press-bonded glass plate in the optical system is separated from the photosensitive surface of the microfilm on which the image on the recorded microfilm is projected, and during projection, the press-bonded glass plate is pressed onto the photosensitive surface of the film. A micro camera reader characterized in that a means for holding a film is provided. 2) The micro camera reader according to claim 1, wherein the optical system includes a film holding plate that is in constant surface contact with the non-photosensitive surface of the film. 3) The micro camera reader according to claim 2, wherein the film holding plate is a heat shielding filter.