JPH05333438A - Contact type printer - Google Patents

Abstract

PURPOSE:To obtain a contact type printer obtained by simplifying the cleaning of a glass plate for exposure and a Fresnel lens and facilitating the maintenance thereof. CONSTITUTION:The Fresnel lens 34 collimating light from a light source 85 and the glass plate for exposure 31 on which an original is placed are supported by a coupling supporting part 37 by giving a prescribed distance, and an interval between them is set as an optical path chamber 67 whose inside is made airtight by a sealing member. Then, air passed through a suction filter is sent to the chamber 67 from a cooling fan 121. As a result, dust or air including the component of ammonia gas or the like does not enter the chamber 67. Besides, even when the dust or the like slightly enters, it is exchanged to the cleaned air. Thus, since the dust or the like is not attached on the surface of the lens 34 or the inside surface of the transparent plate for exposure faced to the optical path chamber, the lens 34 and the plate 31 need not be cleaned.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention holds a document between an exposure transparent plate and a photosensitive material, and irradiates light from a light source from a side of the exposure transparent plate through a Fresnel lens to expose the photosensitive material. The present invention relates to a contact printer that prints an original image on a material.

[0002]

2. Description of the Related Art Conventionally, as a contact printer of this type, for example, there is one disclosed in Japanese Patent Laid-Open No. 1-243042. That is, as shown in FIG. 7, the contact printer 201 is provided with a casing 202 and an upper portion of the casing 202.
Exposure glass plate 205 on which 3 is placed, and the original 203
Adhesion mechanism 211 for adhering the photosensitive film 207 placed thereon to the original 203 with the adhering member 209, and the Fresnel lens 213 installed in parallel with the exposure glass plate 205.
And a light source 215 that emits light to the original 203 side through the Fresnel lens 213.

In the contact printer 201, the light source 215 is used.
The light from is spread radially and is incident on the Fresnel lens 213. Since the light source 215 is arranged at the position of the focal length of the Fresnel lens 213, the Fresnel lens 2
The light incident on 13 becomes parallel light. The parallel light passes through the original 203 and reaches the photosensitive film 207. At this time, the photosensitive film 207 is exposed to light corresponding to the shadow, color and the like projected on the original 203. Manuscript 20
Since the light passing through 3 is parallel light, the original 2
The image No. 03 is accurately printed on the photosensitive film 207. A cooling fan (not shown) is provided in the housing 202 to cool the light source 215 and prevent the light source 215 from overheating.

[0004]

In such a contact printer 201, the exposure glass plate 205 and the Fresnel lens 2 are used.
Since the stains on 13 directly affect the image quality, it is necessary to keep the exposure glass plate 205 and the Fresnel lens 213 clean. However, in the conventional contact printer 201, cleaning of the exposure glass plate 205 and Fresnel lens 213 was troublesome.

That is, due to the operation of the cooling fan, convection occurs and dust or the like enters from the outside, and the glass plate 20 for exposure is exposed.
5 and the Fresnel lens 213. In addition, a developing device (not shown) for developing the printed photosensitive film 207 is often installed around the contact printer 201. The developing device normally uses ammonia, but this ammonia gasifies and enters the housing 202 of the contact printer 201. Then, the ammonia gas reacts with water vapor or the like in the air to become an ammonia compound, which adheres to the surface of the exposure glass plate 205 or the surface of the Fresnel lens 213 to cloud them. If the Fresnel lens 213 or the like is fogged, the image becomes unclear and the exposure time becomes long. To deal with such fogging or the like, the contact printer 201 is disassembled and the exposure glass plate 205 and the upper and lower surfaces of the Fresnel lens 213 are combined to polish the four surfaces.
Such polishing work (cleaning) is time-consuming and troublesome, and has a problem that the surface of the Fresnel lens 213 is scratched during cleaning.

Further, the wind sent from the cooling fan to the light source 215 is heated by the light source 215 and flows between the Fresnel lens 213 and the exposure glass plate 205.
It stays in the meantime. The accumulated air thermally deforms the lens surface 213a of the Fresnel lens 213, which is a plastic lens that is easily affected by thermal deformation. For example, in the case of the Fresnel lens 213 having a diameter of 1000 mm, the temperature change of 20 ° C. causes expansion and contraction of 1.5 mm. There is also a problem that such expansion and contraction of the Fresnel lens 213 reduces the accuracy of image copying.

Further, the exposure glass plate 205 is heated by repeating the printing of the document, and this heat is transmitted through the exposure glass plate 205 to the document 203 and the photosensitive film 2.
It is transmitted to 07 and these expand and contract. And, it has also been a cause of misregistration due to the difference in these expansion rates.

Further, when the temperature of the atmosphere in which the contact printer 201 is installed changes abruptly, dew condensation occurs on the surface of the Fresnel lens 213 and the like, and the image quality is deteriorated due to the influence of this dew condensation. ..

The present invention solves the above-mentioned problems of the prior art, is easy to clean, does not cause thermal distortion of the Fresnel lens, and has high precision and excellent image quality. The purpose is to provide a contact printer.

[0010]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above problems, holds an original document between an exposure transparent plate and a photosensitive material, and also through a Fresnel lens from the exposure transparent plate side. In a contact printer that prints an image of an original on a photosensitive material by irradiating it with light from a light source,
The exposure transparent plate and the Fresnel lens are separated from each other by a predetermined distance, and a sealing member that hermetically or semi-hermetically seals the optical path chamber formed by the exposure transparent plate, the Fresnel lens, and the connection support member is connected to the optical path chamber. An air blowing and discharging means for blowing and discharging air into the optical path chamber,
Cleaning means for cleaning the air blown into the optical path chamber by the air blowing and discharging means.

The invention according to claim 2 is, as the air blowing / discharging means according to claim 1, provided with a blowing means for blowing outside air into the optical path chamber and at one end of the optical path chamber so that the air in the optical path chamber has a predetermined pressure or more. It is configured by including an opening / closing valve that communicates with the outside air when it becomes low.

Further, the invention of claim 3 comprises a cooling means as an air blowing and discharging means, and a circulation path for circulating the air in the optical path chamber through the cooling means.

[0013]

In the contact printer according to the first aspect of the present invention, the light passing through the Fresnel lens from the light source is applied to the original through the exposure transparent plate. As a result, the image of the original is printed on the photosensitive material.

The Fresnel lens and the transparent plate for exposure are supported at a predetermined distance by a connecting support member, and an optical path chamber is provided between them. The reason why the Fresnel lens and the transparent plate for exposure are separated from each other by a predetermined distance is to avoid the influence of a ghost near the Fresnel lens. Further, the optical path chamber is made airtight or semi-airtight by interposing a seal member which seals a gap formed between the connection support member, the exposure transparent plate and the Fresnel lens. Further, an air blowing / exhausting means for blowing and discharging air is connected to the optical path chamber, and a cleaning means for cleaning the air blown into the optical path chamber by the air blowing / exhausting means is provided.

Therefore, the air cleaned by the cleaning means is introduced into the optical path chamber by the air blowing and discharging means. As a result, air containing components such as dust and ammonia gas does not enter the optical path chamber, and even if a small amount of air enters, it is quickly discharged. Therefore, dust or the like does not adhere to the lens surface of the Fresnel lens facing the optical path chamber or the inner surface of the exposure transparent plate, and it is not necessary to clean them.

Further, the air in the optical path chamber rises due to the heat generated from the light source, but is exchanged with the air blown by the air blowing and discharging means. Therefore, the influence of heat transmitted to the photosensitive material and the original is eliminated, and a high quality image can be obtained.

Further, since the air introduced into the optical path chamber lowers the temperature inside the optical path chamber, it prevents dew condensation on the Fresnel lens or the like due to the difference between the temperature inside the optical path chamber and the outside air temperature.

The air blowing / discharging means according to the second aspect of the present invention comprises an on-off valve and a blowing means.
The air in the optical path chamber is swiftly exchanged via the on-off valve by blowing air into the optical path chamber by the air blowing means.

Further, the air blowing / discharging means in the invention of claim 3 is provided with a cooling means, and the air in the optical path chamber is circulated in the circulation path through the cooling means. Therefore, the air in the optical path chamber is cleaned by the cleaning means and cooled by the cooling means.

[0020]

Preferred embodiments of the present invention will be described below in order to further clarify the constitution and operation of the present invention described above.

FIG. 1 is an external view of the contact printer 1 and FIG. 2 is a sectional view thereof. The contact printer 1 includes a housing 2, an exposure unit 3 provided on the upper portion of the housing 2, a light source unit 8 provided below the exposure unit 3, and a cooling unit for cooling the light source unit 8 (shown in the figure. (Omitted), a contact mechanism unit 10 for contacting the photosensitive film F and the document G (see FIG. 5) on the exposure unit 3, and a blower mechanism 12 for blowing air to the exposure unit 3.

As shown in FIGS. 3 and 4, the exposure section 3 includes an exposure glass plate 31, a lens section 35 having a Fresnel lens 34 sandwiched between an upper surface protection glass 32 and a lower surface protection glass 33, and It is provided with a connection support portion 37 that supports between the exposure glass plate 31 and the lens portion 35.
The Fresnel lens 34 is made of acrylic resin, and has an upper surface formed on the lens surface 34a and a lower surface formed on a flat surface.

The connecting support portion 37 is a lower frame body 4 having a U-shaped cross section.
1 and the upper frame body 43 are combined in a quadrangular cross section. The lower surface protection glass 33 is held on the inner flange portion 45 of the lower frame body 41 via a lens surface seal member 47 made of a closed-cell sponge. A Fresnel lens 34 is arranged on the upper surface of the lower surface protection glass 33, and the lens surface 34 of the Fresnel lens 34 is further arranged.
The surface a is covered with the upper surface protective glass 32. The Fresnel lens 34 and the upper surface protection glass 32 are screwed and fixed by an L-shaped stopper 59 or the like via a seal member or the like. On the other hand, a rubber seal member 63 is attached to the upper surface of the upper frame 43 along the upper surface of the upper frame 43.

The exposure glass plate 31 and the Fresnel lens 34 are installed in parallel with each other with a predetermined distance therebetween by a connecting support portion 37, and a space between them serves as an optical path chamber 67. The optical path chamber 67 has a function of avoiding a ghost generated near the lens surface 34a of the Fresnel lens 34, that is, a local condensing and an influence of irregular reflection due to a groove of the lens surface 34a. The optical path chamber 67 is sealed by the seal member 63, the lens surface seal member 47, and the like, so that the portion between the connection support portion 37 and the exposure glass plate 31 and the lens portion 35 becomes airtight. ing.

Further, as shown by the solid line in FIG. 2, the exposure section 3 is housed so as to be locked by a lock mechanism (not shown) with respect to the housing 2 so as to cover the upper open end thereof. As shown by the chain double-dashed line in FIG. 2, when the lock mechanism is disengaged, the guide 71 is guided in the direction of the arrow while being held at a predetermined angle by the support rod 77 and the support arm 78 with springs and opened. Has been done.

The light source section 8 includes a light source 85 located substantially in the center of a bowl-shaped reflector 81, a filter 86, and a reflecting mirror 8.
7 and. This light source 85 is an electrodeless light source close to a point light source, and when it is turned on, the filter 86 and the reflecting mirror 8
The ultraviolet ray having a wavelength for exposing the photosensitive film F is irradiated via 7.

The cooling unit 9 is constructed to blow outside air to the light source 85 by a fan (not shown) to cool the light source 85.

The contact mechanism unit 10 is housed around a spring roller (not shown) in the roller cover 105 on the front end side of the contact printer 1 and is made of rubber whose one end is fixed to the front end (left side in FIG. 2) of the housing 2. Sheet 104, a sheet winding and unfolding mechanism (not shown) for unfolding the sheet 104 from the spring roller on the exposure glass plate 31 and winding the sheet 104 on the roller, and the connection support portion 37 on the right side of FIG. A suction device (not shown) connected to the exhaust portion 107 provided therethrough is provided.

The blower mechanism 12 is, as shown in FIG.
It is arranged around the lower side of the connection support portion 37. The blower mechanism 12 includes a cooling fan 121 arranged on the horizontal plate 2A and fixed to the connection support portion 37. The cooling fan 121 is a general-purpose blower driven by a motor (not shown). The blowout opening 123 of the cooling fan 121 is connected to one end of a pipe line 126. The other end of the conduit 126 is connected to an introduction opening 128 formed in the side wall of the connection support portion 37.

An adsorption filter 125 is installed in the middle of the conduit 126 so as to face the blowout opening 123. The adsorption filter 125 is a filter that removes dust and the like contained in the air flowing through the pipe 126 and contains activated carbon that adsorbs ammonia gas and the like.

On the other hand, the above-mentioned introduction opening 128 of the optical path chamber 67.
As shown in FIG. 4, a discharge opening 129 is formed in the connection support portion 37 on the opposite side. A pipe 131 is connected to the discharge opening 129, and the pipe 131 is connected to a filter housing 135 that houses an adsorption filter 133. Filter housing 1
An opening 135a is provided below the lower frame 35,
It communicates with the outside air through the opening 41a formed in the.
Therefore, when the internal pressure of the air in the optical path chamber 67 is higher than the outside air, the suction filter 133, the opening 135a, and the opening 4 are used.
It is discharged through 1a.

Next, the printing operation of the contact printer 1 will be described. First, the original G is placed on the exposure glass plate 31, and the photosensitive film F is placed on the original G. Next, the sheet winding and unfolding mechanism unfolds the sheet 104 from the roller cover 105 so as to cover the photosensitive film F. At this time, the peripheral edge of the sheet 104 has the seal member 63.
Sealed by. Further, the exhaust unit 10 by the suction device
The space covered with the sheet 104 is evacuated through the sealing portion through the sheet 7, and the sheet 104 is brought into close contact with the photosensitive film F and the original G and the original G and the exposure glass plate 31 in a laminated state.

Next, when the light source 85 is turned on, the radial light from the light source 85 is corrected into parallel light by the Fresnel lens 34, and the original G is irradiated. The light that has entered the document G reaches the photosensitive film F via the document G, whereby the image of the document G is accurately printed on the photosensitive film F.

Simultaneously with the printing operation of the contact printer 1, as shown in FIG.
The air is blown to 7. That is, when the cooling fan 121 is driven at the same time when the power switch (not shown) is activated, the air from the cooling fan 121 is pressure-fed from the blowout opening 123 to the optical path chamber 67 via the conduit 126. At this time, when the air blown from the cooling fan 121 passes through the adsorption filter 125, dust, ammonia gas and the like are removed and the air enters the optical path chamber 67. At this time, the optical path room 67
Is hermetically sealed by the sealing member 63 for the glass surface and the sealing member 47 for the lens surface, the air sent under pressure from the cooling fan 121 raises the atmospheric pressure in the optical path chamber 67. The air in the optical path chamber 67 of which the atmospheric pressure is high is supplied from the discharge opening 129 of the connection support portion 37 to the conduit 13.
1 is sent to the adsorption filter 133 side, and after dust and the like is adsorbed by the adsorption filter 133, it is discharged to the outside through the openings 135a and 41a. The optical path chamber 67 communicates with the outside air through the adsorption filter 133. However, even if the pressure inside the optical path chamber 67 becomes lower than the outside air, the adsorption filter 133 removes dust from the outside air. No dust will enter the 67.

Therefore, the air in the optical path chamber 67 is replaced with the purified air that is pressure-fed from the cooling fan 121 through the adsorption filter 125. As a result, the optical path room 6
Dust or the like hardly enters the inside of the optical path 7, and even if it enters a little, it is quickly discharged from the inside of the optical path chamber 67 to the outside.
Therefore, dust or the like does not adhere to the lens surface 34a of the Fresnel lens 34 or the surface of the exposure glass plate 31, and it is not necessary to clean the lens surface 34a of the Fresnel lens 34 or the inner surface of the exposure glass plate 31.

Incidentally, in order to remove the deposits on the upper surface of the exposure glass plate 31, a cleaning solvent may be used for polishing and cleaning. To clean the lower surface of the lower surface protection glass 33, the lock mechanism holding the exposure unit 3 in the housing 2 is removed, and the front end of the exposure unit 3 is lifted by the guide of the guide 71.
The exposure unit 3 is held with the support rod 77 opened at a predetermined angle. In this state, the lower surface of the lower surface protection glass 33 is cleaned. Therefore, the surface to be cleaned may be two surfaces, that is, the upper surface of the exposure glass plate 31 and the lower surface of the lower surface protection glass 33, and the exposure unit 3 is disassembled to remove the lower surface of the exposure glass plate 31 and the upper surface of the lower surface protection glass 33. Easy to clean as it does not have to be polished.

The heat generated by the light source 85 is transferred to the air in the optical path chamber 67 via the Fresnel lens 34 and the like, and the air in the optical path chamber 67 is exchanged with the outside air blown from the cooling fan 121. Therefore, the photosensitive film F and the original document G are not affected by the heat transmitted from the optical path chamber 67, and the image quality is not deteriorated due to the expansion and contraction.

Further, from the cooling fan 121 to the optical path chamber 67.
Since the temperature inside the optical path chamber 67 becomes the same as the outside temperature due to the air blown into the inside, condensation occurs on the Fresnel lens 34, the exposure glass plate 31, etc. due to the difference between the temperature inside the optical path chamber 67 and the outside temperature. Can be prevented.

FIG. 6 is a sectional view of a main part according to another embodiment of the present invention. That is, the discharge opening 1 of the connection support portion 37
A check valve 141 is provided at 29. Check valve 14
1 includes a valve body 143 and a spring 145 that biases the valve body 143 in the valve closing direction.
Operates so as to open against the biasing force of the spring 145 when the pressure inside the optical path chamber 67 is higher than the external pressure by a predetermined pressure or more, and closes with the biasing force of the spring 145 when the pressure is lower than the external pressure.

In the other embodiment, the cooling fan 12 is used.
The air blown by 1 is pressure-fed from the blowout opening 123 to the optical path chamber 67 via the conduit 126. Then, when the pressure in the optical path chamber 67 exceeds a predetermined pressure, the check valve 14
1 is opened, and the air in the optical path chamber 67 is discharged to the outside. Therefore, the air in the optical path chamber 67 is replaced with the purified air blown from the cooling fan 121. It should be noted that the check valve 141 causes the optical path chamber 6 to be blown by the cooling fan 121.
Since the valve is opened only when the pressure inside 7 becomes high and is closed at other times, outside air containing dust and the like does not enter when the cooling fan 121 is not driven.

The present invention is not limited to the above-described embodiment, but can be carried out in various modes without departing from the scope of the invention, and the following modifications can be made.

(1) In the above embodiment, the cooling fan 12
1 is fixed to the connection support portion 37 of the exposure unit 3 and the cooling fan 121 is integrally moved with the exposure unit 3 at the same time when the exposure unit 3 is opened and closed. However, the present invention is not limited to this.
21 may be fixed to the horizontal plate 2A of the housing 2 and connected to the optical path chamber 67 using a bellows-type flexible hose.

(2) The check valve for communicating the optical path chamber 67 with the outside air may be an electromagnetic valve using a solenoid in addition to the pneumatic valve using a spring as in the above embodiment. In this case, the cooling fan 121 is configured to open in conjunction with driving.

(3) In the embodiment shown in FIG. 6, the cooling fan 2
1 has a configuration in which the outside air is directly taken in and pressure-fed to the optical path chamber 67, but a pipe line for connecting the inlet of the cooling fan 121 and the outlet of the check valve is provided to circulate the air in the optical path chamber 67. May be. In this case, there is an effect that dust and the like of the outside air can be further prevented from entering. Also in this embodiment, the cooling effect can be increased by providing the cooling means in the circulation path.

(4) In the above embodiment, the exposure section 3 is rotated by a predetermined angle with respect to the case 2 to open the upper part of the case 2, but the exposure section 3 can be slid horizontally. The opening / closing structure or the detachable structure may be used.

(5) Connection support portion 3 in the above embodiment
7 is formed as a separate member from the exposure glass plate 31 and the Fresnel lens 34, but this may be integrated with the exposure glass plate 31, the Fresnel lens 34, and the like. For example, a configuration may be used in which a recess serving as an optical path chamber is formed in the exposure glass plate 31 and the peripheral edge of the exposure glass plate 31 serves as a connection support portion and is integrated with the exposure glass plate 31.

[0047]

As described above, according to the present invention,
In the optical path chamber which is airtightly or semi-airtightly formed by the seal member between the connection supporting member, the exposure transparent plate and the Fresnel lens, the air purified by the cleaning unit is discharged by the air blower discharging unit. Blown. The blown air increases the pressure in the optical path chamber, and the air in the optical path chamber is discharged. Therefore, purified air is sent into the optical path chamber, dust, ammonia gas components, and the like hardly enter, and even if a small amount of dust enters, it is quickly discharged to the outside. As a result, the lens surface of the Fresnel lens facing the optical path chamber and the inner surface of the exposure transparent plate are not contaminated and need not be cleaned.

Further, the air in the optical path chamber receives the heat generated from the light source, but the influence of the heat transmitted to the photosensitive material and the original is eliminated by the introduction of the outside air by the air blowing and discharging means. Therefore, there is almost no shrinkage of the photosensitive material or the original due to heat during printing, and the image quality is not deteriorated. Further, since the air introduced into the optical path chamber makes the temperature inside the optical path chamber the same as the outside air temperature, dew condensation on the Fresnel lens and the like due to the difference between the temperature inside the optical path chamber and the outside air temperature is prevented.

The air blowing / discharging means according to the second aspect of the present invention is constituted by the opening / closing valve and the blowing means, so that when the air pressure by the blowing means exceeds a predetermined value, the opening / closing valve opens to ensure the air in the optical path chamber. Can be discharged to.

Further, the air blowing and discharging means in the invention of claim 3 is provided with a cooling means, and the air in the optical path chamber is circulated in the circulation path through the cooling means. Therefore,
Since the air in the optical path chamber circulates while being cooled through the circulation path, the cooling effect is excellent, and the cleaning including the dust and the like is further maintained without being mixed with the air containing dust.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a contact printer according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the outline of the contact printer of the embodiment.

FIG. 3 is a cross-sectional view showing an essential part of an exposure unit and a blowing mechanism of the contact printer of the embodiment.

FIG. 4 is a cross-sectional view showing a main part of an exposure unit of the contact printer of the embodiment.

FIG. 5 is a schematic configuration diagram for explaining the operation of the same embodiment.

FIG. 6 is a cross-sectional view showing a main part of an exposure unit of the contact printer of the embodiment.

FIG. 7 is a vertical cross-sectional view showing a schematic configuration of a conventional contact printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Contact printer 2 ... Housing 2A ... Horizontal plate 3 ... Exposure part 8 ... Light source part 10 ... Adhesion mechanism part 12 ... Blow mechanism 31 ... Exposure glass plate 32 ... Top protective glass 33 ... Bottom protective glass 34 ... Fresnel lens 34a ... Lens surface 35 ... Lens part 37 ... Connection support part 41 ... Lower frame 41a ... Opening 43 ... Upper frame 45 ... Inner flange 47 ... Seal member 59 ... L-shaped stopper 63 ... Seal member 67 ... Optical path chamber 71 ... Guide 77 ... Support rod 78 ... Support arm 81 ... Reflector 85 ... Light source 86 ... Filter 87 ... Reflector 104 ... Sheet 105 ... Roller cover 107 ... Exhaust part 121 ... Cooling fan 123 ... Outlet opening 125 ... Adsorption filter 126 ... Pipeline 128 ... Introducing opening 129 ... Discharging opening 131 ... Pipeline 133 ... Adsorption filter 135 ... Filter storage body 141 ... Reverse check 143 ... the valve body 145 ... spring

Claims (3)

[Claims] 1. An image of an original is formed on the photosensitive material by sandwiching the original between the transparent transparent plate for exposure and the photosensitive material and irradiating light from a light source from the transparent plate for exposure through a Fresnel lens. In a contact printer for printing, a sealing member that separates the exposure transparent plate and the Fresnel lens by a predetermined distance, and seals the optical path chamber formed by the exposure transparent plate, the Fresnel lens, and the connection support member in an airtight or semi-airtight manner, An air blowing and discharging unit connected to the optical path chamber for blowing and discharging air to and from the optical path chamber; and a cleaning unit for cleaning the air blown into the optical path chamber by the air blowing and discharging unit. Characteristic contact printer. 2. The air blowing / discharging means includes a blowing means for blowing the outside air into the optical path chamber, and an opening / closing valve provided at one end of the optical path chamber and communicating with the outside air when the air inside the optical path chamber has a predetermined pressure or more. The contact printer according to claim 1, further comprising: 3. The air blowing / discharging means comprises a cooling means,
The contact printer according to claim 2, further comprising a circulation path for circulating the air in the optical path chamber through the cooling means.