JPH11195393A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube device capable of suppressing distortion of intermediate pin cushion distortion on an effective image surface without increasing deflection power and device cost. SOLUTION: An effective image surface A to make display of an image on the inner side of a face panel 4 is formed on a following curved surface. That is, using a rectangular coordinate system comprising an origin O as a center of the effective image surface A on the inner side of the face panel 4, an X-axis as a line passing the origin O and parallel to a long side Xa of the effective image surface A, a Y-axis as a line passing the origin O and parallel to a shorter side Ya of the efective image surface A, and a Z-axis as a line passing the origin O and parallel to a tube axis, a fall Z from the origin O in a tube axis direction at desired points (x, y, z) in an inner surface of the face panel 4 satisfies relation of Z=a1 x<2> +a2 x<4> +a3 y<2> +a4 x<2> y<2> +a5 x<4> y<2> +a6 y<4> +a7 x<2> y<4> to form the curved surface without having inflection points.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube used for a television receiver, a display monitor, and the like.

[0002]

2. Description of the Related Art In a general cathode ray tube, when an electron beam scans in a horizontal direction, the distance from the center of deflection is different between the center of the effective screen and the short side of the effective screen. However, the scanning distance of the electron beam is different. In order to correct the distortion of the display image due to this, S-shape correction is performed to make the slope portion of the sawtooth wave which is the deflection current waveform into an S-shape.

In this case, the correction is performed such that the right and left pin distortions are zero at the short sides of the effective screen, which are the left and right ends in the horizontal direction of the effective screen, while keeping the S-character correction amount constant. However, in recent years, with the increase in size of the cathode ray tube device and flattening of the screen of the cathode ray tube device, the distance from the center of deflection of the electron beam to the center of the effective screen and the distance from the deflection center to the short side of the effective screen have been increased. Since the difference with has become even larger,
As shown in FIG. 6 (a), the short side Y _a of the short side Y _a parallel y-axis and the effective screen A central street effective screen A valid screen A
In the middle part between the two, vertical pinned intermediate pin distortion 1a, 1b
Or occur, as shown in FIG. 6 (b), the upper and lower in the middle portion of the long side X _a of the long sides X _a in parallel x-axis and the effective screen A central street effective screen A valid screen A Intermediate pin distortions 1e and 1f of the horizontal lines occur, and in particular, when performing a work such as CAD, phenomena such as a straight line being distorted in a curved shape on the effective screen A and a perfect circle being distorted in an elliptical shape appear. Has a problem that the temperature decreases.

Therefore, in a conventional cathode ray tube device,
For example, as disclosed in JP-A-5-83585, an effective screen A is provided by providing an additional circuit such as a modulation transformer in a deflection circuit and superimposing a parabola wave synchronized with a vertical signal on a horizontal signal. The distortion amount δ ′ of the intermediate pin distortion 1a, 1b of the above vertical line is suppressed.

[0005]

However, in the conventional cathode ray tube device having such a configuration, it is necessary to newly provide an additional circuit such as a modulation transformer in the deflection circuit. However, there are problems that the deflection power is increased by about 10% and the price of the apparatus is increased by the additional circuit.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and it is an object of the present invention to suppress the amount of intermediate pin distortion on an effective screen without increasing the deflection power and the price of the apparatus. It is an object of the present invention to provide a cathode ray tube device which can be used.

[0007]

To achieve the above object, a cathode ray tube device according to the present invention comprises a substantially rectangular face panel having a phosphor screen formed on an inner surface, a cone portion, and an inner portion. A glass bulb in which a neck portion having an electron gun is sequentially formed, a deflection coil provided on the outer peripheral surface of the cone portion and the neck portion of the glass bulb, and a deflection for applying a deflection current to the deflection coil. Wherein the effective screen in the face panel has a concave curved surface for suppressing the amount of intermediate pin distortion. According to the configuration of this cathode ray tube device, the amount of intermediate pin distortion can be suppressed without providing an additional circuit such as a modulation transformer in the deflection circuit, so that the deflection power can be reduced. Inexpensive cathode ray tube device can be realized.

Further, in the configuration of the cathode ray tube device of the present invention, the concave curved surface is a curved surface having no inflection point, the radius of curvature of the cross section on the long side of the effective screen is R _t , and the center of the effective screen is when the cross-sectional radius of curvature on the axis along the longitudinal direction of the (origin) as the effective screen (long axis) was R _h, R _t / R
_h is preferably set in the range of 1 to 1.9. According to this preferred example, when performing work such as CAD, phenomena such as a straight line being distorted in a curved shape on an effective screen and a true circle being distorted in an elliptical shape are not caused. Therefore,
It is possible to realize a cathode ray tube device in which workability does not decrease. In this case, the distance from the center (origin) of the effective screen to the diagonal end of the effective screen is D, the length of half of the long side of the effective screen is H, and the short side of the effective screen is V is half the length and the aspect ratio V / H of the effective screen
Α, the cross-sectional radius of curvature on the diagonal axis of the effective screen is R _d ,
The half angle of the deflection angle is defined as θ _D, and δ and σ are represented by the following (Equation 7),
When defined by (Equation 8), it is preferable that R _t / R _h satisfies the following relationship (Equation 9).

[0009]

(Equation 7)

[0010]

(Equation 8)

[0011]

(Equation 9)

In this case, it is preferable that the relationship of R _d = R _h is further satisfied. In the configuration of the cathode ray tube device of the present invention, the concave curved surface is a curved surface having no inflection point,
In addition, the cross-sectional radius of curvature on the short side of the effective screen is R _s , and the cross-sectional radius of curvature on an axis (short axis) passing through the center (origin) of the effective screen and along the lateral direction of the effective screen is R _v . When
It is preferable that R _s / R _v be set in the range of 1 to 3.4. According to this preferred example, when performing work such as CAD, a straight line is distorted in a curved shape on the effective screen,
The phenomenon that the perfect circle is distorted into an ellipse does not appear. Therefore, it is possible to realize a cathode ray tube device without lowering workability. In this case, the distance from the center (origin) of the effective screen to the diagonal end of the effective screen is D, the length of half of the long side of the effective screen is H, and the short side of the effective screen is V is half the length, α is the aspect ratio of the effective screen, α is the cross-sectional radius of curvature of the effective screen on the diagonal axis, R _d , half the deflection angle is θ _D, and ε and τ are When defined by the following (Equation 10) and (Equation 11), it is preferable that R _s / R _v satisfies the following relationship (Equation 12).

[0013]

(Equation 10)

[0014]

[Equation 11]

[0015]

(Equation 12)

In this case, it is preferable that the relationship of R _d = R _v is further satisfied.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described more specifically with reference to embodiments. FIG. 1 is a sectional view showing a cathode ray tube device according to an embodiment of the present invention. As shown in FIG. 1, a cathode ray tube device 2 of the present embodiment has a substantially rectangular face panel 4 having a phosphor screen surface 3 formed on an inner surface, a cone portion 5, and an electron gun 6 inside. A glass bulb 8 having a neck portion 7 formed sequentially, a deflecting device 10 having a cone portion 5 of the glass bulb 8 and a deflection coil 9 provided on the outer peripheral surface of the neck portion 7, and a deflection current to the deflection coil 9. And a deflection circuit 11 for applying the voltage. The shape of the effective screen A for displaying an image inside the face panel 4 is a concave curved surface 4a, so that the distortion amount of the intermediate pin distortion can be suppressed. That is, the effective screen A is formed in a curved surface without an inflection point, as shown by a solid line in FIG. For example, the center of the effective screen A inside the face panel 4 as the origin O, the short sides of the line parallel to the long sides X _a of the origin O of the street effective screen A x-axis, the origin O street effective screen A Y _a From the origin O at an arbitrary point (x, y, z) on the inner surface of the face panel 4 using a rectangular coordinate system having a line parallel to the y axis as the y axis and a line passing through the origin O and parallel to the tube axis as the z axis. Head Z in the axial direction
Is Z = a ₁ x ² + a ₂ x ⁴ + a ₃ y ² + a ₄ x ² y ² +
^{_{a 5 x 4 y 2 + a}} 6 y 4 + a 7 satisfies the relationship of x ² y ⁴ are formed in a curved surface without inflection points.

Here, as shown in FIG.
From the center of plane A (origin O) to the diagonal end of effective screen A
Distance is D, distance from origin O to deflection center is l, deflection angle
Half angle (deflection half angle) of θ_D, Long side X of effective screen A_a
H is the length of half of the short side Ya of the effective screen A
Is V, and the aspect ratio V / H of the effective screen A is α. Ma
In addition, as shown in FIG.
X_aRadius of curvature on a line parallel to
Called "radius". ) To R_h, Long side X of effective screen A _aBreak on
The radius of curvature of the surface (hereinafter referred to as the “radius of curvature on the long side”)
R_t, The short side Y of the effective screen A passing through the origin O_aOn a line parallel to
Radius of curvature (hereinafter referred to as “radius of curvature on the vertical axis”)
To R_v, Short side Y of effective screen A_aUpper radius of curvature (below
It is called "radius of curvature on short side." ) To R_s, Effective screen A pair
The radius of curvature of the section on the square axis is R_dAnd

In this case, as apparent from FIG. 4A, the following relationship (Equation 13) holds.

[0020]

(Equation 13)

The horizontal component θ of the deflection half angle θ _D
H is represented by the following (Equation 14).

[0022]

[Equation 14]

Also, the incident angle θβ at x = βH
_H is represented by the following (Equation 15).

[0024]

(Equation 15)

By substituting the above (Equation 13) into the above (Equation 15), the following (Equation 16) is obtained.

[0026]

(Equation 16)

[0027] FIG. 4 (b) is shows a cross section of the long side X _a of the effective picture A, (1) is the sectional curvature radius conventional curved surface R _t1, (2) has a cross-sectional radius of curvature R ₁₂ shows a curved surface of the present embodiment at _t2 .

The heads Z ₁ and Z ₂ shown in FIG. 4B can be expressed as the following (Equation 17) and (Equation 18).

[0029]

[Equation 17]

[0030]

(Equation 18)

When these are approximated by a quadratic equation, the heads on the respective curves (1) and (2) can be expressed as the following (Equation 19) and (Equation 20).

[0032]

[Equation 19]

[0033]

(Equation 20)

Here, if the difference between the heads Z ₁ and Z ₂ is expressed as the following (Equation 21), the difference between the head on the curve (1) and the head on the curve (2) at x = βH γ can be expressed as the following (Equation 22).

[0035]

(Equation 21)

[0036]

(Equation 22)

If R _t2 = kR _t1 , the above (Equation 17) is obtained.
(Number 18), from the equation (21), the difference b between the drop Z ₁ and drop Z ₂ can be approximated by the following equation (23).

[0038]

(Equation 23)

The correction amount σβ _H for the vertical pin intermediate pin distortion at x = βH is given by (Equation 16), (Equation 22), and (Equation 2).
By using 3) and replacing R _t1 with R _h , the following equation (24) can be obtained.

[0040]

(Equation 24)

Accordingly, the correction ratio σ ′ for the vertical pin intermediate pin distortion
beta _H is normalized by the length 2V of the short side Y _a of the effective picture A the (Expression 24), can be expressed as follows (Equation 25).

[0042]

(Equation 25)

In addition, the original distortion amount δ 'of the intermediate pin distortion of the vertical line before application of the present embodiment around x = (3/4) H
Can be expressed by the following empirical formula (Equation 26) from the actual value of each type of cathode ray tube device in which the shape of the effective screen is a curved surface.

[0044]

(Equation 26)

Here, A = 7.7920 × 10 ⁻³ , B =
It is 2.9428 × 10 ⁻² . Accordingly, the distortion amount ρ after the correction of the vertical pin intermediate pin distortion can be expressed by the following (Equation 27).

[0046]

[Equation 27]

Assuming that the standard value of the distortion amount ρ after the correction of the vertical pin intermediate pin distortion is L%, the value of k can be defined by the following (Equation 28), so that β = 3/4, and , Δ and σ are defined by the following (Equation 29) and (Equation 30).
The above equation (24), the equation (26), if modified with the (number _{27), k = R t2 /} R t1 = R t / R h following equation (31) as an expression for defining the scope of the can get.

[0048]

[Equation 28]

[0049]

(Equation 29)

[0050]

[Equation 30]

[0051]

(Equation 31)

The vertical pin intermediate pin distortion rate (vertical line intermediate pin distortion rate)
Distortion amount ρ after correction of (1a, 1b) / short side of effective screen A
Y_aThe allowable limit value L (half the length) (this value is
± 0.24% (determined by sensory test of display)
So that k = R_t2/ R _t1= R_t/ R_hIs the above (number
31) is set within a range satisfying.

In the above, the improvement of the intermediate pin distortion of the vertical line has been described. Next, an embodiment of the improvement of the intermediate pin distortion of the horizontal line will be described. The intermediate pin distortion of the horizontal line is the same as that of the intermediate pin distortion of the vertical line, and can be easily explained by considering the vertical and horizontal directions in reverse. That, V and H, replacing the R _t and R _s, R _h and R _v, the alpha 1 / alpha, the [delta] epsilon, replaced with a sigma tau, also = the coefficient A and the coefficient B y (3/4 ) By replacing the coefficients A ′ and B ′ with respect to the original distortion amount δ of the intermediate pin distortion of the horizontal line before application of the present embodiment around V,
The following (Equation 32), (Equation 33), and (Equation 34) are obtained.

[0054]

(Equation 32)

[0055]

[Equation 33]

[0056]

(Equation 34)

[0057] Intermediate pincushion distortion ratio of horizontal lines allowable limit L (the value of (the horizontal line of the intermediate pincushion distortion (1e, half of the long side X _a length of strain amount [rho / effective screen A after correction 1f)) is , Determined by sensory test of actual display) ± 0.14%
K ′ = R _s / R _v is set so as to satisfy the above (Equation 34).

In the present embodiment, the shape of the effective screen A inside the face panel 4 is defined as Z = a ₁ x ² + a
^{_{2 x 4 + a 3 y 2}} + a 4 x 2 y 2 + a 5 x 4 y 2 + a 6
It expressed in relation of ^{_{y 4 + a 7 x 2 y}} 4 , but not necessarily limited to the shape to satisfy this relationship. The shape of the effective screen A inside the face panel 4 may be a concave curved surface that suppresses the distortion amount of the intermediate pin distortion.

Next, a cathode ray tube having the above configuration
The operation and effect of the device will be described. Conventionally, S
The character correction amount is fixed, and the short side Y of the effective screen A is set._aLeft and right
Is corrected so that the distortion becomes zero.
As shown by the broken line in FIG.
Screen A shows both the radius of curvature on the horizontal axis and the radius of curvature on the long side.
To R_t1Is formed on the curved surface of FIG.
As shown in the figure, vertical intermediate pin distortions 1a and 1b occur.
At this time, the short side Y from the center (y-axis) of the effective screen A_aUntil
The distortion amount δ ′ of the intermediate pin distortions 1a and 1b of the vertical line of FIG.
The distribution shown by the broken line is obtained. In contrast, in the present embodiment,
In other words, the distortion amount δ ′ of the vertical intermediate pin distortions 1a and 1b is suppressed.
In the face panel 4 so that
In screen A, the radius of curvature on the horizontal axis is R_t1, The radius of curvature on the long side is
R indicated by a solid line in FIG._t2(> R_t1) Is a concave surface
Is formed. For this reason, as shown in FIG.
Long side X_aUpper y-axis and shorter side Y_aIn the middle part between
The radius of curvature on the side is the same as the conventional R _t1To R_t2(> R_t1Changes to
The electron beam 12 arrives due to the curved surface step
The point shifts from the conventional arrival point 13 to the arrival point 14, and FIG.
As shown in (a), the conventional vertical pinned intermediate pin distortions 1a, 1a
b is corrected to vertical pin intermediate pin distortions 1c and 1d. This and
The solid line shown in FIG. 5 is the correction amount of the vertical pin intermediate pin distortion.
The short side Y from the center (y-axis) of the effective screen A_aMiddle to
Of the vertical pin intermediate pin strains 1a and 1b at
The distribution is corrected to the distribution indicated by the one-dot chain line in FIG. In addition, long side X_a
At the upper end portions 15, the curved surface step did not occur.
, Short side Y_aThe upper right and left pin distortion becomes zero.

As described above, the deflection circuit does not need to be provided with an additional circuit such as a modulation transformer, which is conventionally required.
Since the amount of distortion δ ′ of the vertical intermediate pin strains 1a and 1b can be suppressed, the deflection power can be reduced and an inexpensive cathode ray tube device can be realized.

The concave curved surface 4a of the face panel 4 is
It is formed into a curved surface without inflection points,
Distortion rate (distortion amount ρ after correction of vertical pin middle pin distortion / effective
Short side Y of screen A_aThe allowable limit L of length) is ± 0.24%
So that k = R_t2/ R _t1= R_t/ R_hIs the above (number
31) is set within the range that satisfies CAD.
When performing any work, the straight line is curved on the effective screen A
Phenomena such as distortion or distortion of a perfect circle into an ellipse
There is no. As a result, the cathode ray does not reduce workability
A tube device can be realized.

As for the correction of the intermediate pin distortion of the horizontal line, when compared with the correction of the intermediate pin distortion of the vertical line, there is only a difference between the vertical line and the horizontal line. Therefore, the horizontal axis is set to the vertical axis, and the long side is set to the short side. By reading again, the effect can be similarly explained.

Accordingly, the amount of distortion δ 'of the horizontal intermediate pin distortions 1e and 1f can be suppressed without providing the deflection circuit with an additional circuit such as a modulation transformer, which has been conventionally required. Can be made smaller,
An inexpensive cathode ray tube device can be realized.

The concave curved surface 4a of the face panel 4 is
Is formed in a curved surface without inflection points, the intermediate pin distortion of horizontal lines (horizontal line of the intermediate pincushion distortion 1e, half of the short side Y _a length of strain amount [rho / effective screen A after correction 1f) Since k = R _s / R _v is set within the range satisfying the above (Equation 34) so that the allowable limit value L becomes ± 0.14%, CA
When performing the operation such as D, the phenomenon that the straight line is distorted in a curved shape on the effective screen A or the true circle is distorted in an elliptical shape does not appear. As a result, it is possible to realize a cathode ray tube device in which workability does not decrease.

Next, the present invention will be further described with reference to specific examples.
This will be described in detail. <Embodiment 1> In the cathode ray tube apparatus of this embodiment, FIG.
Of a 19-inch cathode ray tube device 2 having the configuration shown in FIG.
Shape of the effective screen A inside the base panel 4
a₁x^Two+ A_Twox^Four+ A_Threey^Two+ A_Fourx^Twoy^Two+ A_Fivex
^Foury^Two+ A₆y^Four+ A₇x^Twoy^FourIn the above relational expression, a₁
= 4.0322 × 10^-Four, A_Two= 6.6465 × 10
^-11 , A_Three= 5.9043 × 10^-Four, A_Four= -5.42
20 × 10^-9, A_Five= -1.2582 × 10^-15, A₆
= -4.4083 × 10^-9, A₇= 1.3385 × 10
^-13And stipulated. At this time, the diagonal axis of the effective screen A
Upper section radius of curvature R_dIs 1240mm, half curvature on horizontal axis
Diameter R_hIs 1240 mm, radius of curvature R on the vertical axis_vIs 990
mm, radius of curvature R on the long side_tIs 1434 mm and k =
R_t/ R_h= 1.16. This is the above (Equation 2)
9), (Equation 30) is D = 228.6 mm, R_d= R_h=
1240mm, θ_D= 50 °, α = 0.75
Δ and σ to be obtained and allowable limit value of vertical pin middle pin distortion rate
Where L = 0.24% is substituted into the above (Equation 31).
1.02 <k <1.34. Ma
Also, the actual vertical pin intermediate pin distortion rate is 0.02%,
It is within the standard value.

In this embodiment, when defining the shape of the effective screen inside the face panel 4, R _d = R _h
However, it is not always necessary to make the values of _Rd and _Rh the same, and even if they are different values, the desired effect can be obtained.

In this embodiment, k = R _t / R
_Although the value of _{h is in} the range of 1.02 <k <1.34,
This range of k is obtained by calculation, and the range of k at which the intermediate pin distortion does not matter in practice is 1 <k <1.9.
It is.

<Embodiment 2> The cathode ray tube apparatus of this embodiment is
In addition, a 19-inch size cathode ray having the configuration shown in FIG.
Shape of effective screen A inside face panel 4 of pipe device 2
And the head Z = a₁x^Two+ A_Twox^Four+ A_Threey^Two+ A_Fourx^Two
y^Two+ A_Fivex^Foury^Two+ A₆y^Four+ A₇x^Twoy^FourThe above
In the engagement, a₁= 4.716847 × 10^-Four, A_Two= 1.
069439 × 10^-Ten , A_Three= 4.032239 × 1
0^-Four, A_Four= −3.482765 × 10^-9, A_Five= −
2.085193 × 10^-15, A₆= 6.606631
× 10 ^-11, A₇= −1.284873 × 10^-15And
Stipulated. At this time, the cross section on the diagonal axis of the effective screen A
Radius of curvature R_dIs 1240 mm, radius of curvature R on the horizontal axis_hIs
1060mm, radius of curvature R on vertical axis_vIs 1240 mm,
Radius of curvature R on short side_sIs 1758 mm, and k ′ = R_s
/ R_v= 1.42. This is given by (Equation 32) above,
D = 228.6 mm, R_d= R_v= 124
0 mm, θ_D= 50 °, α = 0.75
Δ and σ are the allowable limit values of the horizontal pin intermediate strain rate.
This is a range in which L = 0.14% is substituted into the above (Equation 31).
1.08 <k '<2.03. In addition,
The intermediate pin distortion rate of the horizontal line at the time is also 0.01%, the standard value
Inside.

In this embodiment, when defining the shape of the effective screen inside the face panel 4, R _d = R _v
However, it is not always necessary to make the values of _Rd and _Rv the same, and the desired effect can be obtained even when each value is different.

In this embodiment, k '= R _s /
The value of R _{v is in} the range of 1.08 <k ′ <2.03, and the range of k ′ is obtained by calculation.
The range of k 'at which the intermediate pin distortion does not matter in practice is 1 <
k ′ <3.4.

[0071]

As described above, according to the present invention,
It is possible to reduce the amount of intermediate pin distortion without providing an additional circuit such as a modulation transformer in the deflection circuit, thereby reducing the deflection power and realizing an inexpensive cathode ray tube device. Can be.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cathode ray tube device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a shape of an effective screen in a face panel of the cathode ray tube device according to the embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the cathode ray tube device according to the embodiment of the present invention for suppressing the amount of distortion of intermediate pin distortion.

FIG. 4 is a diagram for specifying a shape of an effective screen in a face panel of the cathode ray tube device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a distribution of a distortion amount of an intermediate pin distortion of the cathode ray tube device in the embodiment of the present invention.

FIG. 6 is a diagram showing an intermediate pin distortion of a conventional cathode ray tube device.

[Explanation of symbols]

 Reference Signs List 2 cathode ray tube device 3 phosphor screen surface 4 face panel 4a concave curved surface 5 cone portion 6 electron gun 7 neck portion 8 glass bulb 9 deflection coil 11 deflection circuit

Claims (8)

[Claims] 1. A glass bulb in which a substantially rectangular face panel having a phosphor screen surface formed on an inner surface, a cone portion, and a neck portion having an electron gun therein are sequentially formed, and a cone of the glass bulb. A deflection coil provided on the outer peripheral surface of the portion and the neck portion, and a deflection circuit for applying a deflection current to the deflection coil, wherein the shape of the effective screen in the face panel is A cathode ray tube device having a concave curved surface for suppressing the amount of distortion of intermediate pin distortion. 2. The cathode ray tube device according to claim 1, wherein the concave curved surface has no inflection point. 3. A cross-sectional radius of curvature on a long side of the effective screen is R _t , and a cross-sectional radius of curvature on an axis (long axis) passing through the center (origin) of the effective screen and extending in the longitudinal direction of the effective screen is R. _h
And when, R _t / R _h is a cathode ray tube apparatus according to claim 2 which is in the range of 1 to 1.9. 4. The distance from the center (origin) of the effective screen to the diagonal end of the effective screen is D, the length of half of the long side of the effective screen is H, and the half of the short side of the effective screen is half. Length is V,
Α is the aspect ratio of the effective screen, R _d is the cross-sectional radius of curvature of the effective screen on the diagonal axis, θ _D is half the deflection angle, and δ and σ are (Equation 1) 4. The cathode ray tube device according to claim 2, wherein R _t / R _h satisfies the following formula (3) when defined by the formula (2). (Equation 1) (Equation 2) (Equation 3) 5. The cathode ray tube device according to claim 4, wherein a relationship of R _d = R _h is satisfied. 6. A cross-sectional radius of curvature on a short side of the effective screen, R _s , and a cross-sectional radius of curvature on an axis (short axis) passing through a center (origin) of the effective screen and along a lateral direction of the effective screen. R _v
The cathode ray tube device according to claim 2, wherein R _s / R _v is set in a range of 1 to 3.4. 7. The distance from the center (origin) of the effective screen to the diagonal end of the effective screen is D, the length of one half of the long side of the effective screen is H, and the half of the short side of the effective screen is half. Length is V,
The aspect ratio V / H of the effective screen is α, the cross-sectional radius of curvature of the effective screen on a diagonal axis is R _d , the half angle of the deflection angle is θ _D, and ε and τ are (Equation 4), 7. The cathode ray tube device according to claim 2, wherein R _s / R _v satisfies the following expression (6), as defined by the expression (5). (Equation 4) (Equation 5) (Equation 6) 8. The cathode ray tube device according to claim 7, wherein a relationship of R _d = R _v is satisfied.