JPS58211152A - Image pickup device of microfilm camera - Google Patents

Abstract

PURPOSE:To shorten a cooling time before exposure and to improve the efficiency of photographing operation by exchanging a heating body and a cooling body alternately and pressing a film surface held on an image-formation focal plane with a fixing frame against the heating and cooling body, and then performing exposure. CONSTITUTION:A prescribed area of a film 100 is set on a photosensitive frame 40 with a photographic base 20 and a motor 28 is driven to lower a moving member 22 guided by plural pins 21; and pressurized air is supplied through the operation of a solenoid valve 43 to press the film 100 against the heating body 31. The moving member 22 is elevated after the air is applied for a specified time, and when a holder 30 is rotated by 90 degrees through the operation of a motor 37, the cooling body 32 faces the film. Then, the moving member 22 is lowered to press the film 100 against the cooling body 32 uniformly with the pressurized air even if there is thermal strain of the film, and thus the focal plane is held and exposed by opening and closing a shutter 46. Therefore, the film before exposure contacts the cooling body directly, so the cooling time is shortened and the efficiency of the operation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image forming apparatus for a heat-developable film, and more specifically, the present invention relates to an image forming apparatus using a heat-developable film. The present invention relates to an imaging device for forming an image in a predetermined area on a film.

Conventionally, films of the above type have been produced, for example, by
5484, JP-A-52-73022, JP-A-53 (1983)
4201 and Japanese Patent Laid-Open No. 54-87213.

An object of the present invention is to provide a method for cooling the film when performing pre-heating, cooling, exposure and post-heating steps on the imaging focal plane when forming an image on a predetermined region of the film. The object of the present invention is to provide a device that can save time.

Conventionally, if the film is distorted during exposure, the focus will be blurred, so in order to prevent this distortion, when heating a predetermined area of the film, a thin trap plate is interposed between the film and the heating element, and the film is heated. Heating is performed through the thin plate, and further pressurized air is used on the side of the film opposite to the thin plate to press the film against the thin plate to block thermal expansion of the film,
Furthermore, even after the heating is completed and the heating element separates from the thin plate, pressurized air is used to press the film against the thin plate, and in order to increase the sensitivity of the film, the thin plate is air-cooled to ensure that the film is cooled to a predetermined temperature. After waiting, I started exposure.

However, in the conventional method, since the film is cooled through the thin plate by air cooling, it takes a lot of time to cool the film, the cycle time of photographing becomes long, and the efficiency of the photographing operation is poor.

The present invention provides an apparatus that uses a cooling block instead of air cooling to shorten the cooling time before exposure, shorten the cycle time, and thereby increase the efficiency of the photographing operation.

The main components of the present invention include a fixed frame for holding a predetermined area of the film at the imaging focal plane, a heating element for heating the film, and a cooling member for cooling the heated film before exposure. a holding body for holding the heating body and the cooling body; a switching means for switching the holding body between the heating body and the cooling body with respect to a predetermined area of the film; and pressing the heating body or the cooling body against the predetermined area of the film. The following is an example in which the imaging device according to the present invention is used in a four-microphone four-film camera using four-film film.
This will be explained based on FIGS. 1 and 2.

First, let's talk about the imaging section. The upper side of the heat-developable film 100 shown in the vertical center in FIG.
, the lower side is the exposure section 300. The film Zoo is set on a front guide roller Iota so that it can be set at a predetermined position in the imaging section 200 and the memorial section 300.

101b and rear guide roller 102a, 1
It is set in 02b. The guide roller is attached to the imaging base 2°. An imaging base 20 is arranged above a part of the film 100, and a plurality of bins 21 are set up on a part 20a of the imaging base 20. The moving member 22 is moved via a bearing 22a as necessary. The film 100 can be smoothly moved toward or away from the film 100 using the bin 21 as a guide.

For example, the part 22b of the moving member 22 and the motor 2 are connected via a bottle 23, a lever 24, a bottle 25, a lever 26, and a motor output shaft 27, and a half rotation of the motor output shaft 27 causes the moving member 22 to By bringing the moving member 22 closer to the film 100 and turning another half turn, the moving member 22
can be kept away from the film Zoo.

The motor 28 is preferably a pulse motor that can rotate and stop at a specified rotation angle with high precision.

'@, The heating element 31 and cooling element 32 (see FIG. 2) attached to the holding member 30 are attached to the moving member 22 using the film 10.
Means are also provided which can be switched to zero.

For example, a shaft and a foot 33 may be passed through the holding member 30 and moored to the moving member 22 via a bearing 34 as necessary to enable smooth rotation. Further, one end 36 of the shaft 33 and the holding member ao l;l:, which is firmly fixed using a set screw 35, is connected to a drive source that rotates the holding member 30. For example, a pulse motor 37 that can rotate and stop at a specified rotation angle with high precision may be fixed to the moving member 22.

The cooling body 32 presses the film 100 against the exposure frame 40 during exposure, and also serves to bring out the focal plane.

The bin 21 for vertical movement and the shaft 33 for rotation are
They are arranged so that they do not collide with each other.

As explained above, the heating body 31
When the heating element 31 or the cooling element 32 is switched between the heating element 31 and the cooling element 32, it is possible to bring the switched heating element 31 or cooling element 32 close to the film 100 or to move it away from the film 100.

The above are the main components of the imaging section, and these are rollers 103a, 103b, 104a, and 10 for shielding light.
4b is housed in a monument light box 105.

Next, the configuration of the light regulating section 300 will be explained.

A portion 20b of the imaging base 20 is located below the film 100, and a cylindrical exposure frame 4o is fixedly attached to this partial base 20b. An opening is formed in the partial base 20b, and one end of the cylindrical exposure frame 40 is fitted into the opening. The upper end surface of this exposure frame 4o faces the heating body 31 or the cooling body 32.

A nozzle 41 for receiving pressurized air into the exposure frame 40 is attached to the exposure frame, and the nozzle 41 is connected to a pressurized air source (not shown) via a hose 42 and a three-way solenoid valve 43. . As a source of pressurized air, for example, an aquarium pump can be used.

The solenoid valve 43 works by introducing pressurized air into the M light frame 40 only for the necessary time to bring it into a pressurized state.
The function is to release the pressurized air inside the exposure frame 40 into the atmosphere without introducing pressurized air into the exposure frame 40.

The pressurized air serves to press the film 100 against the heating body 3 or the cooling body 32 during pre-heating, cooling, heating and post-heating. By doing so, the focal length during uniform heating, uniform cooling, and exposure of the film ioo can be maintained with high precision.

A lens 44 is attached to the lower end of the exposure frame 40 using an O-ring 45 to prevent leakage of pressurized air, if necessary. Center line A is the optical axis of lens 44.

A shutter 46 is arranged within the exposure frame 40, and the shutter 4
6 is fixedly attached to the shaft 47, and the shutter 4
In order to open and close the shutter 46, the shaft 47 protrudes outside the exposure frame 40, and if necessary, a shaft 47 (not shown) is arranged to prevent pressurized air from leaking from the protrusion. It is connected to a drive off-shore (not shown) for use. For example, a motor or a rotary solenoid may be used as the driving source.

In FIG. 1, the unwinding means for the roll film, the winding means, the shutter driving means, the temperature control means, the series of sequence control means for photographing, etc. are not shown.

Next, one embodiment of the heating body 31 will be described.

The heat source of this heating element 31 is a surface heating element 31a, and the peripheral edge of the back surface of the heating element 31a is adhered to the holding member 30 via an elastic body 31b such as silicone rubber.

The purpose of the elastic body 31b is to transfer the heat of the heating element 31a to the holding member 30.
The purpose of this is to prevent the film 100 from being conducted to the surface and to bring the film 100 into contact with the end surface of the exposure frame 40 with a uniform pressing force when the film ioo is heated.

The size of the surface of the heating body 31 that comes into contact with the film ioo is:
This almost corresponds to the so-called frame, which is the area of film for one shooting.

Next, one embodiment of the cooling body 32 will be described.

The cooling body 32 has a metal block 32a having high thermal conductivity bonded to the holding member 30 via an elastic body 32b such as silicone rubber. The block 32a is provided with fins to improve heat radiation.

The purpose of the elastic body 32b is to allow the block 32a to bring the film 100 into contact with the end face of the exposure frame 40 with uniform pressing force during cooling and exposure of the film 100.

The thickness of the surface of the cooling body 32 that comes into contact with the film IQO is
This almost corresponds to the so-called frame, which is the area of film for one shooting.

Next, the movement of the imaging section when photographing one frame using the imaging apparatus of the present invention will be explained based on FIGS. 1 and 2.

First, a predetermined area of the film Zoo is set on the exposure frame 40.

Next, the motor 2B is rotated clockwise by 80 degrees and then stopped, the moving member 22 is lowered, and the heating element 31 is brought into contact with the film. At the same time, the solenoid valve 43 is operated to supply pressurized air into the exposure frame 40 to create a pressurized state, and the film 100 is
is pressed against the heating element 31. Motor 2 after heating for a predetermined time
8 is rotated 180 degrees clockwise and then stopped, the moving member 22 is raised, and the heating body 31 is separated from the film 100.

In addition, immediately before separating the heating body 31 from the film 100,
The magnetic valve 43 is operated to stop the supply of pressurized air to the exposure frame 40 and at the same time release the pressurized air inside the exposure frame 40 into the atmosphere to prevent distortion of the film 100 due to the pressurized air.

Next, the motor 37 is activated to rotate the support body 30 clockwise 901′ and stop, and the cooling body 32 is moved to the film 100.
Next, the motor 28 is rotated 1800 degrees clockwise and stopped, the moving part side 22 is lowered, and the cooling body 32 is brought into contact with the film Zoo. At the same time, the solenoid valve 43 is operated to supply pressurized air into the exposure frame 40 to pressurize the film 100 against the cooling body 32. Since the film 100 is in direct contact with the cooling body 32, the film 100
0 is rapidly cooled. The feature of the present invention is that even if the film 100 is thermally distorted due to pre-heating, the film 100 is evenly pressed against the cooling body 32 by pressurized air, and uniform cooling and the focal plane can be maintained with high accuracy.

Next, the shutter 46 is operated to open and close j41 at a predetermined time, and the exposure is completed.

Next, the motor 2B is rotated in the direction of 1800 hours and then stopped, the movable part 22 is ground, and the cooling force 132 is separated from the film ioo.

In addition, just before removing the cooling body 32 from the film 100, the valve 43 is opened (1) to apply pressure to the inside of the light frame 40.
At the same time, the pressurized air inside the light frame 40 is released into the atmosphere to prevent the film 100 from being distorted by the pressurized air.

Next, the motor 37 is activated, the holding body 30 is rotated 90° counterclockwise in one direction and then stopped, and the heating body 31 is rotated against the film 10.
Then, the motor 28 is rotated 180 degrees clockwise and then stopped, the movable part 22 is lowered, and the heating body 31 is brought into contact with the film 100. At the same time, the solenoid valve 43
is activated to supply pressurized air into the L light frame 40 to pressurize it and press the film ioo against the heating body 31.

After heating for a predetermined time, the motor 28 is rotated in the 180° rotation direction and stopped, the moving member 22 is moved up, and the heating body 31 is separated from the film 100.

Before the heating element 31 is removed from the film 100, the cannonball 43 is actuated to stop the supply of pressurized air into the light frame 40 and to release the pressurized air in the light frame 4o into the atmosphere. This prevents distortion of the film 100 due to pressurized air.

With this, one-frame scanning is completed.

In addition, in the above-mentioned embodiment, a film that does not require preheating and is heated for development, such as a "dry silver film", can also be used as the film lOo.
! In case of ii, preheating is done by 1 g, omitted).

If the pre-heating temperature and post-heating humidity are small, it is sufficient to switch the temperature of one heating element to the temperature for pre-heating and post-heating, or to switch the temperature of one heating element to the temperature for pre-heating and post-heating. Holding body 3 for heating body
It may be attached to 0.

Furthermore, by applying negative pressure to the contact surfaces of the heating and cooling bodies with the film, the film can be pressed against the surfaces of the heating and cooling bodies.

Incidentally, the method of switching between the heating body and the cooling body may be other than the method described in the above embodiment. For example, a so-called turret system may be used in which a heating element and a cooling element are mounted on l discs.

As mentioned above, according to the present invention, the film is cooled before thermal light by direct contact between the film and the cooling body, so the cooling time is shortened and the cycle time for photographing can be shortened. It has the effect of increasing work efficiency.

[Brief explanation of drawings]

Figure 1 shows the main parts of an example of an imaging device for a microfilm camera according to the present invention, and in the figure, a 200mm image forming section 300 is an exposure section. FIG. 2 shows the heating body, cooling body and their holders shown in FIG. 1. Patent applicant Asahi Kasei Niji Corporation

Claims (1)

[Claims] In a camera using a film which is normally non-photosensitive and which develops its photosensitive properties by pre-heating prior to exposure and which can be developed by post-heating after exposure, one or more heating means and one or more cooling means are used. a holding means for holding the heating means and the cooling means; a switching means for switching between the heating means and the cooling means with respect to the imaging focal plane; and a pressing member for pressing the heating means or the cooling means against the imaging focal plane. An imaging device for a microfilm camera, characterized in that it has means.