JP3278210B2 - Thermal recording material for overhead projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an overhead project.
That it is used to create a transparent document to be projected by the Ekuta
The present invention relates to a heat-sensitive recording material for Wow bar head projector.

[0002]

2. Description of the Related Art Overhead projectors (hereinafter OH)
P), a transparent document is set on a Fresnel mirror, and illumination light is applied from above the transparent document, so that light transmitted through the transparent document is reflected upward by the funnel mirror, and the screen is passed through a photographing lens. Is projected onto

[0003] There is also known a heat-sensitive recording material for OHP in which at least one heat-sensitive coloring layer is formed on a transparent sheet, for example, polyethylene terephthalate (PET). This OHP thermosensitive recording material is set in a thermal printer, and characters and images are thermally recorded by a thermal head. The heat-sensitive recording material for OHP, for which heat recording has been completed, is light-fixed by irradiating ultraviolet rays with an ultraviolet lamp so as not to develop color even if heat is applied to an unrecorded portion during storage.

[0004]

When the above-mentioned heat-sensitive recording material for OHP is irradiated with ultraviolet light for light fixing, the ultraviolet light passes through the support and escapes to the opposite side.
Therefore, as compared with a general thermosensitive recording material in which the support is paper, the amount of effective ultraviolet rays hitting the thermosensitive coloring layer is reduced, so that there is a problem that the fixing efficiency is poor and the fixing time is long.

[0005] The present invention aims to provide a fixing efficiency is not high O HP for heat-sensitive recording material.

[0006]

In order to solve the above problems SUMMARY OF THE INVENTION, O HP for heat-sensitive recording material of the present invention is to So設the thermosensitive coloring layer on the surface of the transparent support, ultraviolet back surface of the support The reflection sheet that reflects the light is bonded to be releasable. Therefore, the ultraviolet rays irradiated from the heat-sensitive coloring layer side do not escape from the support, and are reflected on the support and irradiate the heat-sensitive coloring layer again, so that the efficiency of light fixing is remarkably improved and the fixing time is shortened. You.

[0007]

In FIG. 1, a heat-sensitive recording material 10 for OHP of the present invention comprises a transparent support 1 made of, for example, a PET sheet.
1, a cyan thermosensitive coloring layer 12, a magenta thermosensitive coloring layer 13, a yellow thermosensitive coloring layer 14, and a protective layer 15 are sequentially provided, and a material that reflects ultraviolet rays via a transparent adhesive layer 16 on the back face . For example, a reflection sheet 17 made of a thin aluminum sheet is peelably joined. The back surface of the support 11 is subjected to surface processing such as coating so that the adhesive layer 16 does not remain after the reflection sheet 17 is peeled off.

The cyan thermosensitive coloring layer 12 contains an electron-donating dye precursor and an electron-accepting compound as main components, and develops cyan when heated.

As the magenta thermosensitive coloring layer 13, a diazonium salt compound having a maximum absorption wavelength of about 365 nm;
It contains a coupler that reacts with heat and develops magenta. When the magenta thermosensitive coloring layer 13 is irradiated with ultraviolet light near 365 nm after thermally recording a magenta image with a thermal head, the diazonium salt compound is photolyzed and loses its coloring ability.

The yellow thermosensitive coloring layer 14 contains a diazonium salt compound having a maximum absorption wavelength of about 420 nm, and a coupler which thermally reacts with the diazonium salt compound to develop a yellow color. The yellow thermosensitive coloring layer 14 is fixed by light when irradiated with near-ultraviolet rays near 420 nm, and loses its coloring ability.
It should be noted that the light is fixed also by near-ultraviolet rays having a higher energy than 365 nm.

In FIG. 2, a thermal printer 20 is
The sheet-like OHP heat-sensitive recording material 10 is reciprocated by the nip roller pair 21, and thermal recording and optical fixing are performed during this time. On the right side of the nip roller pair 21, a platen roller 22 supporting the OHP thermosensitive recording material 10 at a recording position.
And a thermal head 23 for thermally recording an image on the OHP thermosensitive recording material 10 supported thereon. As is well known, the thermal head 23 has a large number of heating elements arranged in a line in the main scanning direction. Each heating element generates thermal energy according to the density of the pixel and thermally records an image on the OHP thermosensitive recording material 10. The platen roller 22 and the nip roller pair 21 are rotated at the same peripheral speed by a pulse motor (not shown).

On the left side of the nip roller pair 21, a recording paper path 26 formed by guide plates 24 and 25 is provided. On the platen roller 22 side, an ultraviolet lamp 27 for emitting ultraviolet light for light fixing is provided. 28 are arranged. The ultraviolet lamp 27 has an emission peak of about 42
A 0 nm rod-shaped yellow fixing member is used, and the ultraviolet lamp 28 is used for magenta fixing having an emission peak of approximately 365 nm. Reflecting films 27a, 28 are provided on 3/4 of these peripheral surfaces.
a is applied, and ultraviolet rays are irradiated toward the OHP thermosensitive recording material 10 from a quarter area facing the platen roller 22 side.

At the end of the recording paper passage 26, a paper supply / discharge port 26a is provided.
The OHP heat-sensitive recording material 10 is inserted one by one from here. The recorded OH discharged from the paper supply / discharge port 26a is located outside the paper supply / discharge port 26a.
A tray (not shown) for accumulating the P thermal recording material 10 is provided.

When the power of the thermal printer is turned on and the thermal recording material 10 for OHP is inserted from the paper supply / discharge port 26a, the thermal recording material 10 for OHP is
1 and is conveyed to the thermal head 23 side.
During this conveyance, the platen roller 22 is rotated clockwise, and the thermal head 23 is retracted from the recording position. The heat-sensitive recording material for OHP 10 has a tip 3
When "a" reaches the position of the nip roller pair 21, the operation is temporarily stopped. At this time, the leading end of the printing portion of the OHP thermosensitive recording material 10 is set at a recording position where the thermal head 23 faces.

Subsequently, the nip roller pair 21 and the platen roller 22 are rotated reversely, and the OHP thermosensitive recording material 10 starts to be conveyed to the left in the drawing. At the same time, thermal recording by the thermal head 23 is started, and the yellow fixing ultraviolet lamp 27 is turned on. Thermal head 2
Each of the heating elements 3 is heated to a temperature in consideration of the coloring property of the yellow thermosensitive coloring layer 14, and the yellow image is thermally recorded line by line on the OHP thermosensitive recording material 10.

When the printing portion reaches below the ultraviolet lamp 27, as shown in FIG. 1, the ultraviolet lamp 27 irradiates near ultraviolet rays of about 420 nm. The near-ultraviolet rays light-fix the yellow thermosensitive coloring layer 14 while the magenta thermosensitive coloring layer 13, the cyan thermosensitive coloring layer 12 and the support 1.
1 and reaches the reflection sheet 17 via the adhesive layer 16. The ultraviolet rays 30 are reflected by the reflection sheet 17 and irradiate the thermosensitive coloring layers 12 to 14 again. As a result, the yellow thermosensitive coloring layer 14 is further light-fixed, so that reliable light fixing is performed in a short time.

After the thermal recording material 10 for OHP is thermally recorded to the rear end of the printing portion by the thermal head 23, it is further continuously conveyed, and all the printing portions thermally recorded by the ultraviolet lamp 27 are irradiated with ultraviolet rays. . When the rear end 3b of the OHP heat-sensitive recording material 10 reaches the nip position of the nip roller pair 21, the rotation direction of the nip roller pair 21 is switched, and the OHP heat-sensitive recording material 10 is conveyed again to the recording position.

After the leading end 3a of the OHP thermosensitive recording material 10 reaches the position of the nip roller pair 21 again, the rotation direction of the nip roller pair 21 and the platen roller 22 is switched, and the thermal recording of the magenta image by the thermal head 23 is started. Is done. At the same time, the ultraviolet lamp 27 is turned off and the ultraviolet lamp 28 for magenta fixing is replaced.
Lights up. When the printing portion where the magenta image is thermally recorded reaches below the ultraviolet lamp 28, ultraviolet light of about 365 nm is irradiated from the ultraviolet lamp 28, and the magenta thermosensitive coloring layer 13 is optically fixed. Also at this time, since the ultraviolet light emitted from the ultraviolet lamp 28 is reflected by the reflection sheet 17, the magenta thermosensitive coloring layer 13 is surely light-fixed.

After the thermal recording of the magenta image is completed, the thermal recording material 10 for OHP is further conveyed, and the magenta thermal coloring layer 13 over the entire printing area is optically fixed. O toward the recording position
The thermal recording material for HP 10 is returned. When the leading end of the printing section reaches the recording position, the rotation directions of the nip roller pair 21 and the platen roller 22 are switched, and the thermal head 23 thermally records a cyan image on the OHP thermosensitive recording material 10. Then, the OHP thermosensitive recording material 10 is conveyed toward the paper supply / discharge port 26a. Again,
The ultraviolet lamp 28 is turned on, and the rear end 3b of the OHP heat-sensitive recording material 10 that has not been irradiated with ultraviolet rays is also irradiated with ultraviolet rays to be bleached. Thus, the heat-sensitive recording material 10 for OHP, on which all the heat recording and light fixing are completed,
Is discharged to an external tray via the paper supply / discharge port 26a.

In the embodiment described above, the reflection sheet is a thin aluminum sheet. However, the present invention is not limited to this. The reflection sheet reflects ultraviolet rays and is bonded to a support of a heat-sensitive recording material for OHP. Any material can be used as long as it can be transported in the thermal printer. In the case of a conventional OHP heat-sensitive recording material for OHP, the print result can be checked by placing it on a light box or by actually placing it on an OHP.
However, if the reflective sheet is made of a white color using the heat-sensitive recording material for OHP of the present invention, the quality of the printed result can be easily confirmed as it is.

In the above embodiment, a thermal head or an OHP
Although the line printer which records by moving the thermal recording material relatively in the sub-scanning direction has been described, the present invention can also be applied to a serial printer which records by moving relative to two dimensions.

[0022]

As described in detail above, the O of the present invention
According to the heat-sensitive recording material for HP, the heat-sensitive coloring layer is provided on the surface of the transparent support, and the reflection sheet that reflects ultraviolet light is peelably joined to the back surface of the support. Ultraviolet rays are reflected by the reflection sheet and irradiate the thermosensitive coloring layer again. Therefore, the efficiency of light fixing is remarkably improved, and the fixing time can be shortened.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a layer structure of a heat-sensitive recording material for OHP of the present invention.

FIG. 2 is an explanatory view schematically showing a thermal printer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Thermosensitive recording material for OHP 11 Support 12 Cyan thermosensitive coloring layer 13 Magenta thermosensitive coloring layer 14 Yellow thermosensitive coloring layer 16 Adhesive layer 17 Reflection sheet 20 Thermal printer 23 Thermal head 27, 28 UV lamp

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-62-164580 (JP, A) JP-A-4-267160 (JP, A) JP-A-1-285382 (JP, A) JP-A-1- 238687 (JP, A) JP-A-5-318910 (JP, A) JP-A-5-185716 (JP, A) JP-A-4-197778 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41M 5/26-5/34

Claims (1)

(57) [Claims] 1. A heat-sensitive recording material for an overhead projector, comprising a heat-sensitive coloring layer which is colored by heating with a thermal head on a surface of a transparent support and is fixed by light irradiation by irradiating ultraviolet rays. A heat-sensitive recording material for an overhead projector, wherein a reflection sheet that reflects ultraviolet light is peelably bonded to the back of the body.