JPH04156377A - Color thermal recording material and color thermal recording device - Google Patents

Abstract

PURPOSE:To obtain a color thermal recording material which can prevent thermal roughing by providing a protecting sheet on the color thermal recording material for the prevention of thermal roughing on the surface of the material so that the sheet can be peeled off. CONSTITUTION:A protecting sheet 16 is junctioned with a yellow thermal coloring layer 14 through a peel-off layer 15 for the prevention of thermal roughing on a color thermal recording material. This peel-off layer 15 enables a recorded image to be viewed and in this sense, transparent polymer is used. The protecting sheet 16 used is transparent plastic film having superior thermal transmission. If the tip of a recording area on the color thermal recording material 10a reaches a thermal head 24, a yellow image begins to be thermally recorded. When thermally recording the image, a thermal head 2 heats a yellow thermal coloring layer 14 through a protecting sheet 16 and a yellow image is thermally recorded by line on the thermal coloring layer 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color thermosensitive recording material and a color thermosensitive recording device whose surface is prevented from becoming rough due to heat.

[Prior Art] There are two types of thermal recording devices: a thermal recording device and a thermal transfer recording device.These thermal recording devices can thermally record images directly onto a thermal recording material, so they can be used on transfer sheets, etc. It has the advantages of generating no waste and having a simple CLT structure. Because of these features, thermal recording devices tend to be widely used, and for example, most facsimile machines incorporate monochrome thermal recording devices. recently,
For example, as described in JP-A No. 61-213169, a macenta thermosensitive coloring layer is provided on support I].

A color thermosensitive recording device 1 has been proposed in which a cyan thermosensitive coloring layer and a single domesticated thermosensitive coloring layer are sequentially layered to enable direct thermal recording of full-color images.

[Problem to be solved by the invention]

In the color thermal recording mentioned above, when recording the deep thermosensitive coloring layer, a considerable amount of thermal energy is applied by the thermal head, so the part of the gunnel head that comes into contact with the heating element is melted by heat and becomes fine. This creates unevenness. This heat roughening causes roughness on the surface of color thermosensitive recording materials, which is a major cause of deterioration in image quality.

An object of the present invention is to provide a color thermosensitive recording material and a color thermosensitive recording device that can prevent heat roughness.

[Failure to solve the problem]

In order to achieve the above-mentioned objective 1, in the invention described in claim (1), a removable protective sheet for preventing heat roughening is provided on the surface of the color thermosensitive recording material.

In the invention described in claim (2), a protective sheet is interposed between the thermal layer and the color heat-sensitive recording material to prevent heat roughening on the surface of the color heat-sensitive recording material,
Through this protective sheet, a thermal head is used to thermally record the month and month on a color thermographic recorder.

[Function] In the present invention, since the protective sheet 1 is interposed so that the surface of the color thermosensitive recording material does not come into direct contact with the thermal head, thermal roughness does not occur on the color thermosensitive recording +414. In the invention of claim (1), the protective sheet I- is peeled off after thermal recording.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the color thermosensitive recording +A material of the present invention. The color thermosensitive U material 10 has a cyan thermosensitive coloring layer 12 on a support 11. Magenta thermosensitive coloring layer 13
．． Yellow thermosensitive coloring layer 14. Peeling layer 15. Protective sheet 1
6 are sequentially arranged in layers. Each of these thermosensitive coloring layers 12
- 14 are layered from the surface in the order in which they are thermally recorded. For example, when thermally recording magenta, yellow, and cyan in the order, the positions of the yellow thermosensitive coloring layer 14 and the magenta thermosensitive coloring layer 13 are Can be replaced.

As the support 11, an opaque coated paper or a plastic film is used, and when an OHP sheet is created, a transparent plastic film is used.

The cyan thermosensitive coloring layer 12 contains an electron-donating dye precursor and an electron-accepting compound as main components, and develops a cyan color when heated. The magenta thermosensitive coloring layer 13 contains a diazonium salt compound having a maximum absorption wavelength of about 365 nm, and a coupler that thermally reacts with the diazonium salt compound to develop a magenta color. After thermally recording a magenta image with a thermal head, this magenta thermosensitive coloring layer 13 is formed with a 365 nm
When irradiated with ultraviolet light around m, the diazonium salt compound photodecomposes and loses its coloring ability. Yellow thermosensitive coloring layer 14
For example, it contains a diazonium salt compound having a maximum absorption wavelength of about 420 nm and a coupler that develops a yellow color by thermally reacting with the diazonium salt compound. This yellow thermosensitive coloring layer 14,
When irradiated with near ultraviolet light (blue-violet light) of 420 nm (approximately 4), it is photofixed and loses its coloring ability.These magenta thermosensitive coloring layer 13 and yellow thermosensitive coloring layer 14 contain a diazonium salt compound. Therefore, the color thermosensitive recording material 10 is originally yellow. When these thermosensitive coloring layers 13.i4 are optically fixed, the color thermosensitive recording material 10
changes from yellow to white. Note that each heat-sensitive coloring layer 1
The specific configurations of Nos. 2 to 14 are explained in detail in Japanese Patent Application No. 2-89384 filed by the present applicant on April 4, 1990.

In order to prevent thermal roughness of the color thermosensitive recording material, the protective sheet 1G is coated with the yellow thermosensitive coloring layer 14 via the release layer 15.
is joined to. This release layer 15 is made of a transparent polymer so that the recorded image can be observed. As the protective sheet 16, a transparent plastic film with excellent heat transfer is used.

FIG. 2 shows the characteristics of each of the thermosensitive coloring layers 12 to 14. Thermal energy on the horizontal axis represents the thermal energy generated by the heating element of the thermal head, and the thermal energy of the yellow thermosensitive coloring layer 14 = 6- is the lowest, and the thermal energy of the cyan thermosensitive coloring layer 12 is the highest. The main reason for this difference in thermal energy is that the cyan thermosensitive coloring layer 12 is different from the yellow thermosensitive coloring layer 13. This is because heating must be performed via the magenta thermosensitive coloring layer 14. Note that in FIG. 2, the thermal energy is generated without the protective sheet 16 intervening, so it is necessary to increase the thermal energy key in accordance with the heat transfer coefficient of the protective sheet i6.

In FIG. 3 showing a color thermosensitive recording device, a platen drum 20 holds a sheet-shaped color thermosensitive recording material 10a on its outer periphery, and is driven by a pulse motor (not shown) during thermal recording.
rotated by The leading end of the color thermosensitive recording material 10a is clamped onto the platen drum 20 by a clamp member 21.
Fixed.

This clamp member 21 is normally in a clamped state by a spring 23, and when the solenoid 22 is energized, the clamp member 21 is moved to release the clamp.

A thermal head 2 is provided on the outer periphery of the platen drum 20.
4 and an optical fixing device 25 are provided.

As is well known, the thermal head 24 has a large number of heating elements arranged in a line, and generates thermal energy corresponding to the color to be thermally recorded and its color density. The optical fixing device 25 has a bottom 365 as shown by the solid line in FIG.
It consists of a rod-shaped ultraviolet lamp 26 having an emission peak at 420 nm and 420 nm, and a cut filter 27 having transmission characteristics as shown by the dotted line. This Karami filter 27 is driven by a drive device such as a solenoid.
When placed in front of the ultraviolet lamp 26, the
It transmits near ultraviolet rays around m. Note that the reference numeral 28 is the axis of the platen F 20.

Next, the operation of the second embodiment will be explained. When feeding paper, the solenoid 22 is energized to move the clamp member 21 to the clamp release position. When the color thermosensitive recording material 1.0a is placed in the position of the clamp member 21 and the solenoid 22 is turned off, the clamp member 21 is pulled back by the spring 23 and the color thermosensitive recording material 1.0a is clamped. It is clamped at part 21.

Color Thermosensitive Recording Material] After Oa Cera I, the platen drum 20 is rotated. Color thermal recording material 1'l
] When the leading edge of the recording area of Oa reaches the thermal head 24, thermal recording of the yellow image is started. During this thermal recording, the thermal head 24
The yellow thermosensitive color-forming layer 14 is heated through the heating device, and a yellow image is thermally recorded thereon line by line. In this thermal recording of the yellow image, each heating element of the thermal head 24 generates thermal energy taking into consideration the coloring characteristics shown in FIG. 2 and the thermal characteristics of the protective sheet 16. The portion on which the yellow image is thermally recorded reaches the optical fixing device 25, where optical fixing is performed. This optical fixing device 25, cut filter 27
is set in front of the ultraviolet lamp 26, so near ultraviolet rays around 42 Onm are applied to the color heat-sensitive recording material 10a.
is irradiated. As a result, the diazonium salt compound contained in the yellow thermosensitive coloring layer 14 is decomposed and the coloring ability is lost.

When the platen drum 20 rotates once and the recording area reaches the position of the thermal head 24 again, a magenta image is thermally recorded on the magenta thermosensitive coloring layer 13 one line at a time. During thermal recording of a magenta image, the cut-in filter 27 is retracted from in front of the ultraviolet lamp 26, so that all the electromagnetic waves emitted from the ultraviolet lamp 26 are directed to the portion of the color heat-sensitive recording material 10a where the magenta image has been recorded. irradiated. The back of the electromagnetic waves emitted from this ultraviolet lamp 26,
Magenta thermosensitive coloring layer 1 is formed by ultraviolet light around 365 nm.
3 is photofixed. Note that during thermal recording of this magenta image, thermal energy higher than the coloring thermal energy of the yellow thermosensitive coloring layer 14 is applied, but since the yellow thermosensitive coloring layer 14 has already been photofixed, this yellow thermosensitive coloring layer 14 There are no words to express the color.

When the platen drum 20 rotates one more time, the color thermosensitive recording material 10a faces the thermal head 24, so that the thermal head 24 thermally records the cyan image line by line. This cyan thermosensitive coloring layer 12 does not develop color under normal storage conditions because the thermal energy required for thermosensitive coloring is quite high. Therefore, for this cyan thermosensitive coloring layer 12, the optical fixing device 25 is turned off to omit optical fixing.

After thermal recording of the yellow image, magenta image, and cyan image is completed, the solenoid 22 is energized to close the clamp member 2.
1 to the clamp release position, and do not remove the heat-recorded color heat-sensitive material 1.0a from the platen driver 1.20.

Color thermosensitive recording 1.0a, in which color images are recorded, is
The surface of the protective sheet I6 is melted and roughened by the heat of the thermal head 24, but this protective sheet 16 is
You can tear it off from 5.

This protective sheet 16! II, color thermal recording 1
Since the surface of 0a is smooth, a color image without roughness can be obtained.

In the embodiment described above, a removable protective sheet is provided on the color thermosensitive recording material 1', but instead of this, a protective sheet may be sandwiched between the thermal head and the color thermosensitive recording material. FIG. 5 shows this embodiment,
The same portion H as in FIG. 3 is given a reference number. Color thermosensitive recording material 30, support 11 shown in FIG.
．． Cyan thermosensitive coloring layer 12. Magenta thermosensitive coloring layer 13. Yellow I: consists of a thermosensitive coloring layer 14. Note that the yellow thermosensitive color forming layer 14 is not exposed directly.
It is preferable to provide a thin transparent protective layer.

The protective sheet 32 pulled out from the supply reel 35, the guide rollers 33, 3. i and is wound up on the winding wheel 31. These guide rollers 33 and 34 are 2. The thermal head 2 is placed on both sides of the thermal head 24.The protective sheet 32 is moved during thermal recording, and the thermal head 2
4, the color thermosensitive recording material 30 is heated by jJtl.

In the embodiment described above, a platen drum is used, but a heald or slide stage for linear movement may be used instead.

[Effects of the Invention] As explained in detail below, since the color thermosensitive recording material of the present invention uses a protective sheet with multi-releasability, it is possible to eliminate the roughness of the color thermosensitive recording material due to heat roughening. . Furthermore, in the color thermosensitive recording device, since a protective sheet is interposed between the thermal head and the color thermosensitive recording material, heat roughening of the color thermosensitive recording material can also be prevented.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an example of the color thermosensitive recording material of the present invention. FIG. 2 is a graph showing the color development characteristics of color thermosensitive recording material H. FIG. 3 is a schematic diagram showing a color thermosensitive recording device. FIG. 4 is a graph showing the emission characteristics of an ultraviolet lamp and the transmission characteristics of a cant filter. FIG. 5 is a schematic diagram of a color thermosensitive recording apparatus of the present invention. 10... Color thermosensitive recording + A material -1,3- 1,0a... Sheet-shaped color thermosensitive recording material 15...
... Peeling layer 1G ... Protective sheet 20 ... Platen drum 24 ... Thermal head 25 ... Optical fixing device 30 ... Sheet-shaped color thermosensitive recording material 32 ...
・・Protection Sea】・. Imitation - α) Pa he sairyu yakueijisho → well - hemp a horse part

Claims (2)

[Claims] (1) In a color heat-sensitive recording material in which a plurality of heat-sensitive coloring layers with different colors and different recording heat energies are layered on a support, a protective sheet is provided on the surface of the color heat-sensitive recording material to prevent heat roughening. A color heat-sensitive recording material characterized by being provided in a removable manner. (2) In a color thermosensitive recording device that records a color image using a thermal head using a color thermosensitive recording material in which a plurality of thermosensitive coloring layers having different colors and recording heat energies are layered on a support, the thermal head A protective sheet is interposed between the color thermosensitive recording material and the color thermosensitive recording material to prevent heat roughening on the surface of the color thermosensitive recording material, and the color thermosensitive recording material is thermally recorded by a thermal head through this protective sheet. Color thermal recording device.