JPH0618990A - Formation of light shielding part of transmission type screen - Google Patents

Abstract

PURPOSE:To prevent unequal pressing by obtaining uniform and spiral pressing loci on the peripheral surface of a transfer roll along its rotating direction at the time of pressing the projecting parts of a screen base material sheet by means of the transfer roll. CONSTITUTION:This method for formation of the light shielding parts of the transmission type screen consists in forming light absorptive layers by a transfer system on the projecting part surface of a light transparent screen sheet formed with the projecting parts 3 for forming the light shielding parts. The transfer sheet 50 provided with the transfer layer having light absorptivity on the projecting part 3 forming side of the screen base material sheet A is pressurized or heated and pressurized by using the transfer roll 40. In addition, the angler thetaof intersection of the projecting part line direction (m) with the rotating axis direction (n) of the transfer roll is set at d/4R<=costheta<=1/sq. rt. 2, by which the transfer layer is transferred to the projecting part surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type projection screen for enlarging and projecting a television image, which is used for forming a light absorbing layer on a convex portion for forming a light shielding portion on an image observing side. The present invention relates to a method for forming a light-shielding portion of a mold projection screen.

[0002]

2. Description of the Related Art A transmission type projection screen for enlarging and projecting a television image is provided with a large number of lenticular lens parts on the image light incident side of the screen, and a condensing part area by the lens parts on the exit side. There are a plurality of cylindrical lens portions provided opposite to the lens portion, and a plurality of convex light absorbing layers are provided in the non-light-condensing portion region.

As a conventional method for forming the light-shielding portion of the screen, an extruder is used to heat and melt a translucent synthetic resin screen substrate sheet while extruding it.
Molding while pressing the embossing die from both sides of the sheet, a plurality of lenticular lens portions are provided on the incident side of one surface of the sheet, and a plurality of cylindrical lens portions are provided on the exit side of the other surface of the sheet. A translucent screen base sheet having a web shape or a sheet shape provided with a large number of convex portions is manufactured.

FIG. 5 (a) shows a convex portion (3) formed by the above molding.
FIG. 3 is a cross-sectional view showing an example of a translucent screen base material sheet A on which a plurality of stripes are formed on one surface of the base material sheet A (the light-entering side onto which projection image light such as television image light is projected). Of the lenticular lens part (1), and the light emitting part (2) and the light emitting part on the other surface (light emitting side) facing the lens part (1).
A convex part (3) is provided between and (2).

On the convex portion (3) side of the base material sheet A, a transfer paper sheet B having a releasable light absorbing layer (11) (black color layer) on one side of the transfer base material sheet (10) is provided. Overlap. (Fig. 5
(B))

Subsequently, as shown in FIG. 6 (a), transfer from a screen material sheet A on which a transfer paper B is overlaid is made of a relatively elastic rubber or hard rubber for pressurization or heating / pressurization. The light absorbing layer (11) of the transfer paper B is transferred onto the surface of the convex portion (3) by pressing the roll (30).

Incidentally, FIG. 6B is a side view showing a circular transfer system, and FIG. 6C is a side view showing a rotary transfer system.
The transfer roll (30) is capable of pressing and releasing the pressing operation in the vertical direction (O ₁ direction and O ₃ direction) as indicated by the arrow with respect to the surface plate (60) in a fixed state, Direction and O
It reciprocates in _two directions.

When the transfer roll (30) is a fixed rotation transfer roll or a movable transfer roll only in the vertical direction (O ₁ direction or O ₃ direction) or a transfer roll for heating and pressurization (30), The surface plate (60) reciprocates in the O ₄ direction and the O ₅ direction. Further, in the case of the rotary type shown in FIG. 6 (c), the screen base material sheet A on which the transfer paper B is superposed is placed between the rotating transfer roll (30) and the pressure roll (20) opposed thereto. It is sent in ₆ directions.

[0009]

When the screen base material sheet A is pressed by the transfer roll (30), as shown in FIG.
As shown in (a), the convex portion of the screen base sheet A
The screen base sheet A is fed between the transfer roll (30) and the surface plate (60) so that the line direction m of (3) is orthogonal to the rotation axis direction n of the transfer roll (30). When the convex portion (3) is pressed by the rubber transfer roll (30), the ring-shaped concave portion (32) along the rotational direction is pressed against the peripheral surface of the transfer roll (30) by the pressing contact of the convex portion (3). Therefore, there is a tendency that a non-uniform transfer pressure is easily generated by the concave portion (32) with respect to the convex portion (3) of the base material sheet A to be transferred next.

According to the method of the present invention, the convex portion (3) of the translucent screen base material sheet A in the form of a web, or the convex portion of the translucent screen base material sheet A in the form of a sheet after being cut into a sheet shape. The transfer paper B provided with a light-absorbing layer is placed on (3), and the convex portion (3)
The pressure-sensitive transfer roll for pressurization or heating and pressurization, in which the rotation axis direction n is set diagonally to the multiple linear direction m, is pressed to transfer the light-absorbing layer onto the convex (3) surface, By spirally displacing (moving) the transfer roll pressing point against the convex part (3), it is possible to prevent the generation of a ring-shaped pressing track along the rotational direction on the transfer roll peripheral surface, and to prevent uneven distribution. The purpose is to obtain a uniform pressing locus.

[0011]

The method of the present invention is a transmissive screen in which a light-absorbing layer is formed by a transfer method on the convex surface of a translucent screen sheet on which a light-shielding portion-forming convex portion is formed. In the method for forming a light-shielding portion, a transfer sheet having a light-absorbing transfer layer is pressed or heat-pressed on the projection forming side of the screen base sheet using a transfer roll, and the transfer roll is projected in the rotation axis direction. A method for forming a light-shielding portion of a transmissive screen, characterized in that the transfer layer is transferred to the convex surface by setting the intersecting angle θ of the partial line direction to d / 4R ≦ cos θ ≦ 1 / √2.

[0012]

The method of the present invention will be described in detail with reference to the accompanying drawings. 1 (a) is a front view for explaining the method of the present invention, FIG.
1 (b) and 1 (c) are side views for explaining the method of the present invention. As shown in the front view of FIG. 1 (a), a lenticular lens section (1) having a large number of stripes on one side and the above-mentioned on the other side. Lens part
A plurality of light emitting portions (2) and convex portions (3) on both sides of the light emitting portion (2) are provided within the condensing area of the lens portion (1) along the same line direction as (1). After the translucent screen base material sheet A having alternating projections and convex portions (3) is placed on a flat surface plate (60), the screen is placed as shown in the side view of FIG. 1 (b). On the base material sheet A, the easily peelable layer (5) of the transfer base material sheet (51)
A transfer sheet (50) having a light absorbing layer (52) laminated on 1a) is laminated on the light absorbing layer (52) side with the convex portion (3) side of the base material sheet A.

From the upper side of the transfer sheet (50) superposed on the screen base sheet A, as shown in FIG. 1 (c), the linear direction m of the convex portion (3) is changed to a rubber pressure roll, Alternatively, the roll (4) set to ± θ (θ = 45 ° to 85 °) with respect to the rotation axis direction n of the transfer roll (40) such as a heating and pressing roll.
While pressing (0), the roll (40) and the surface plate (60) are relatively moved to press the transfer sheet (50) toward the convex portion (3) side of the screen base sheet A. As shown in FIG. 1 (d), the light absorbing layer (52) of the transfer sheet (50) is transferred onto the convex portion (3) of the screen base material sheet A.

The transferred light absorbing layer (52) is mainly composed of acrylic, polyvinyl chloride, polyvinyl chloride-vinyl acetate copolymer, polyethylene, silicone, wax, lacquer, or a composite thereof. Adhesive resin film or fixed resin film in which a light-absorbing coloring material such as a black colorant is mixed with the film-forming resin of the body, and the film-forming resin is a photo-curable resin, an electron beam-curable resin, or a thermosetting resin. It is also possible to use a resin.

In the method of the present invention, the transfer roll (4
It is possible to transfer by applying pressure or heat and pressure to the convex portion (3) using the transfer roll (40) in which the transfer sheet (50) is wound in advance on the peripheral surface of half or more of (0). In this case,
As the main body of the transfer roll (40), a soft or hard rubber roll or a metal roll can be used.

FIG. 2 is a side view for explaining an example of the method for producing the translucent screen base material sheet A, and the translucent screen substrate is introduced from the resin pellet charging port (70a) of the molten resin extruder (70). 180 ° C by putting synthetic resin (for example, polymethylmethacrylate, polyvinyl chloride, polycarbonate, or composite resin of these) into the extruder (70)
The sheet-shaped synthetic resin screen base material (71) is extruded in a molten state from the T-die (70b) after melting at about 300 ° C.

The extruded base material (71) has a temperature of 110 ° C. to 20 ° C.
Introduced between the first embossing roll (72) heated to around 0 ° C. and the second embossing roll (73) similarly heated to around 110 ° C. to 200 ° C., between the rolls (72) (73) While pressing the base material (71) from both the front and back surfaces, the first embossing roll (72) respectively forms a light emitting portion (2) and a convex portion (3) on the cylindrical lens surface on the front and back surfaces of the base material (71). And again
The embossing roll (73) forms the lenticular lens-like condensing lens part (1).

The first embossing roll (72) is a female die for embossing the convex portion (3) on the peripheral surface of the roll along the circumferential direction in a ring shape or in a spiral shape. A female die for embossing the cylindrical lens-shaped light emitting portion (2) is provided.

The second embossing roll (73), which faces the first embossing roll (72) and rotates in opposite directions, has a ring shape or a spiral shape along the circumferential direction on the roll peripheral surface. In addition, a female mold for embossing the lenticular lens-like condensing lens part (1) is provided.

The cooling roll (74), which faces the second embossing roll (73) and rotates in opposite directions, has a flat smooth surface on its peripheral surface.

A screen base material A which passes between the first and second embossing rolls (72) and (73) and is embossed with a convex portion (3) and a lenticular lens-shaped condenser lens portion (1).
Is approximately the surface temperature 110 of the second embossing roll (73).
Second embossing roll while maintaining the temperature of ℃ to 200 ℃
(73) While embracing the semi-peripheral surface, the second embossing roll
(4) is cooled by being introduced between a cooling roll (74) having a smooth peripheral surface (a set temperature of about 40 ° C to about 60 ° C) facing the (4) and hugging the half peripheral surface of the cooling roll (74). At the same time, it is carried out and cut, and cut into an appropriate size by the sheet cutting means (75) to manufacture the translucent screen base sheet A.

The set temperature for heating and melting by the extruder (70) and the set surface temperatures of the first embossing roll (72), the second embossing roll (73) and the cooling roll (74) are
It is appropriately set according to the type and material of the synthetic resin used as the screen base material (71), and an example thereof is shown in the table below.

[0023]

[Table 1]

As shown in FIG. 3, the linear direction m of the convex portion (3) of the screen substrate sheet A is ± θ with respect to the rotational axis direction n of the transfer roll (40) for pressurization or heat pressurization. (Θ = 45 °
Set to ~ 85 °) and set on the surface plate (60), and roll (40)
While pressing the fixed (stationary) surface plate (60) side,
The transfer roll (40) is laterally moved in a direction O orthogonal to the roll rotation axis direction n.

The optimum value of the intersection angle ± θ between the linear direction m and the rotation axis direction n is set by setting the width (d) of the convex portion (3) of the screen base material sheet A shown in FIG. And the diameter 2R of the transfer roll (40) for pressurization or heat pressurization shown in FIG.

As shown in FIG. 4, the angle + θ of the convex portion (3) of the screen base sheet A in the linear direction m is 45 ° to 85 °.
Of the screen base sheet A
Is sent between the transfer roll (40) and the surface plate (60),
The convex portion (3) (width d) of the screen base sheet A that comes into contact with the transfer roll (40) through the transfer sheet (50) is spiral along the rotation direction of the rotating transfer roll (40) peripheral surface. While advancing in the O direction of the transfer direction while being pressed by the peripheral surface of the transfer roll (40) while leaving the pressing locus S (width d) of the shape.

In this case, it is necessary to set the pressing locus S having the width d to the intersection angle θ so that the transfer roll (40) does not overlap with one rotation. Mn crossing angle θ
, The width d of the convex portion (3) in the direction transverse to the straight line of the transfer roll (40) in the rotation axis direction n
₁ indicates that the pressing locus S in the first rotation of the transfer roll (40) at the intersection angle θ is sin θ = d / d ₁ ∴d ₁ = d / sin θ mn as shown in FIG. The relationship between the mn intersection angle θ, the width d of the convex portion (3), and the diameter 2R of the transfer roll (40) when they are adjacent to each other is expressed as follows. tan θ = 2R / ((1/2) xd ₁ ) tan θ = 2R / ((1/2) x (d / sin θ)) tan θ = sin θ ≦ 4R / d where tan θ / sin θ = 1 / cos θ ∴d / 4R Therefore, the condition of the intersection angle θ at which the pressing loci S of the convex portions (3) do not overlap is d / 4R ≦ cos θ, and the value obtained by this is the upper limit value of θ. Note that the lower limit value of θ is appropriately 45 ° in the present invention. Therefore, the intersection angle θ is set so that cos θ = cos 45 ° = 1 / √2 ∴d / 4R ≦ cos θ ≦ 1 / √2. be able to. Then, in practice, the intersection angle θ is appropriately in the range of 45 ° to 85 °.

In the present invention, the operation mechanism of the transfer roll (40) and the surface plate (60) by the circular transfer system shown in FIG. 1 (c) is the same as the conventional one as shown in FIG. 6 (b). Is what you do.

Further, in the present invention, the transfer sheet (50) is used in addition to the circular pressure method as described in FIGS.
Is a rotary transfer system in which a screen base material sheet A having a plurality of layers stacked thereon is fed between a nip roll composed of a transfer roll (40) for pressure or heat and pressure and a pressure roll facing the transfer roll (40). Of course, the operation mechanism of the transfer roll and the pressure roll in this case is similar to the conventional operation shown in FIG. 6 (c).

As the transfer sheet (50) used in the production method of the present invention, known pressure-sensitive or pressure-sensitive and heat-sensitive transfer paper can be used, and the transfer base sheet (51) is a polyolefin film. Alternatively, cellophane, a polyester film, a paper sheet material, or a composite sheet of these can be used. For example, one surface of the transfer substrate sheet (51) is provided with a mat-shaped fine uneven surface, and the uneven surface is formed. It is possible to use a transfer sheet (50) in which a transfer layer (52) made of a light absorbing coloring material is applied and laminated on the surface.

In addition, between the uneven surface and the transfer layer (52),
It is possible to apply paraffin, wax or the like to intervene if necessary, or to apply a resin adhesive layer having good adhesiveness to the material of the screen base sheet A on the upper surface of the transfer layer (52). Is.

[0032]

The method of the present invention comprises a transfer roll for pressurization or heating / pressurization.
The intersection angle θ of the convex portion (3) of the screen base sheet A with respect to the rotation axis direction n of (40) is d / 4R ≦ cos
By setting so that θ ≦ 1 / √2, the screen base material sheet A is provided between the transfer roll (40) and the surface plate (60) or between the transfer roll (40) and the pressure roll facing the transfer roll (40). Since it is sent in between, the convex portion (3) of the screen base material sheet A, which comes into contact with the roll (40) through the transfer sheet (50), is moved along the rotation direction with respect to the peripheral surface of the transfer roll (40). It is possible to make uniform contact with the axial direction and the entire peripheral surface of the transfer roll (40) while moving it spirally.

[0033]

According to the method of the present invention, the screen base sheet on which the transfer sheets are superposed has the convex line direction thereof at a predetermined angle with respect to the rotational axis direction of the pressure transfer roll or the heat pressure transfer roll. Since the transfer roll is set to intersect and is transferred between the transfer roll and the surface plate or between the transfer roll and the pressure roll opposite to the transfer roll, the peripheral surface of the transfer roll made of rubber is an object to be pressed. It is possible to uniformly press and contact the screen base sheet convex portion over the entire peripheral surface of the roll, and to avoid non-uniform transfer to the screen base sheet that performs the transfer operation next. This is a remarkable effect in improving the quality of the light-shielding portion with respect to the convex portion.

[Brief description of drawings]

FIG. 1 (a) is a front view of a base material sheet placed on a surface plate in one embodiment of the method of the present invention. (B) It is a side view showing a state in which a transfer sheet is superposed on a substrate sheet in one embodiment of the method of the present invention. (C) It is a side view in which the base material sheet is pressed from above the transfer sheet by the transfer roll in one embodiment of the method of the present invention.

FIG. 2 is a schematic side view illustrating a process of manufacturing a screen base sheet.

FIG. 3 is a plan view in which a substrate sheet is pressed from above a transfer sheet by a transfer roll in one embodiment of the method of the present invention.

FIG. 4 is a plan view showing the relationship between the intersecting angle θ between the protrusion linear direction and the transfer roll rotation axis direction in the method of the present invention, and the pressing locus generated on the peripheral surface of the transfer roll.

FIG. 5 is a front view illustrating a conventional light-shielding portion forming method.

FIG. 6A is a plan view illustrating a conventional method of forming a light-shielding portion. (B) It is a side view explaining the conventional general circular pressure type transfer system. (C) It is a side view explaining the conventional general rotary transfer system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lenticular lens part 2 ... Light emitting part 3 ... Convex part for forming light-shielding part 10 ... Transfer base material sheet 11 ... Light-absorbing transfer layer
20 ... Pressure roll 30 ... Transfer roll 31 ... Rotary shaft 32 ... Pressing trajectory 40 ... Transfer roll 41 ... Rotary shaft 50 ... Transfer sheet
51 ... Transfer base material sheet 51a ... Easy peeling material layer 52 ... Light absorbing transfer layer 60 ... Surface plate A ... Translucent screen base material sheet B ... Transfer sheet d ... Convex portion width m ... Convex portion linear direction
n ... rotation axis direction O ... transfer direction S ... pressing trajectory θ ... m
n crossing angle

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[Procedure amendment]

[Submission date] August 17, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 (a) is a front view of a base material sheet placed on a surface plate in one embodiment of the method of the present invention. (B) It is a side view showing a state in which a transfer sheet is superposed on a substrate sheet in one embodiment of the method of the present invention. (C) It is a side view in which the base material sheet is pressed from above the transfer sheet by the transfer roll in one embodiment of the method of the present invention. (D) It is a partially enlarged front view of the transmissive screen showing a state in which the light absorbing layer of the transfer sheet is transferred to the convex portion of the base sheet in one embodiment of the method of the present invention.

Claims (2)

[Claims] 1. A method for forming a light-shielding portion of a transmissive screen, wherein a light-absorbing layer is formed on the surface of the light-transmissive screen sheet on which the light-shielding portion-forming projections are formed, by a transfer method.
A transfer sheet having a light-absorbing transfer layer is pressed or heat-pressed on the projection-forming side of the screen base sheet using a transfer roll, and the projection linear direction intersects with the rotation axis of the transfer roll. The angle θ is d / 4R ≦ cos θ ≦ 1 / √
2. A method for forming a light-shielding portion of a transmissive screen, wherein the transfer layer is set to 2 and the transfer layer is transferred onto a convex surface. 2. The method of forming a light-shielding portion of a transmissive screen according to claim 1, wherein the transfer roll is a transfer roll having a transfer sheet wound in advance on a circumferential surface of a half circumference or more of the roll.