JP2006303828A - Crt video display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CRT video display device in which a user hardly recognizes an inclination of a video image picture caused by raster rotation. <P>SOLUTION: The CRT video display device 14 includes a cathode ray tube 1 on the prescribed tube face 1a of which a video image is displayed, and a cabinet 50 including a frame 5 for surrounding the perimeter of the tube face 1a, wherein an upper frame part 51 and a lower frame part 52 of the frame 5 are respectively formed with slope faces 51a, 52a formed to be curved faces and tilted toward the border between the tube face 1a and the slope faces in directions opposite to each other, and a coloring part 55 is applied to the slope faces 51a, 52a, the coloring part 55 in which a color change from a black color nearly the same color as black stripes of a letter box displayed on the tube face 1a of the cathode ray tube 1 into the prescribed color of the frame 5 is gradually spread in a circular-arc way from the border between the tube face 1a and the slope faces toward the outer circumferential side of the frame 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a CRT video display device.

  2. Description of the Related Art Conventionally, a CRT video display device such as a television using a CRT (Cathode Ray Tube) is known.

  In this CRT video display device, the inner peripheral frame portion of the cabinet adjacent to the display tube surface of the cathode ray tube is painted darker than the outer peripheral side thereof, so that the video screen displayed on the cathode ray tube is made to stand out. An apparatus is known (for example, refer to Patent Document 1).

  Also, the CRT video display device is affected by geomagnetism because it is a mechanism that converts the electric signal into an optical image by controlling the path of the electron beam generated from the cathode by a magnetic field. For example, raster rotation in which the video screen displayed on the cathode ray tube of the display device is tilted may occur due to the influence of geomagnetism in accordance with the installation area and installation direction of the CRT video display device.

  In order to reduce the influence of such geomagnetism, a CRT video display device in which a degaussing coil is provided is known (for example, see Patent Document 2).

Even if this raster rotation occurs, the inclination of the video image is very small. Therefore, when viewing the video with a normal television size (4: 3 / full screen size), the user Hardly recognized the inclination.
JP-A-60-198216 Japanese Utility Model Publication No. 63-147091

  However, in recent years, when a movie or the like is viewed on a CRT video display device, in order to view the video itself in a 16: 9 wide screen size, display in a letterbox size with black bands at the top and bottom of the video screen is performed. There are many more.

  Thus, in the CRT video display device, when displaying in a letterbox size with a black belt, as shown in FIG. 7, the boundary line A between the cabinet 80 and the cathode ray tube 1 of the CRT video display device 17 and the cathode ray tube 1 It becomes easy to visually compare and compare the black belt on the video screen and the boundary line B of the real video area.

  In the case of the above-mentioned Patent Document 1, when raster rotation occurs when displaying in a letterbox size with a black belt, the CRT video display device makes the video screen displayed on the cathode ray tube stand out. It becomes easier to compare the boundary line A and the boundary line B. Then, when the user recognizes the difference in inclination between the boundary line A and the boundary line B, the inclination of the video screen may be recognized.

  In the case of the above-mentioned Patent Document 2, since there is a step 9 at the boundary between the cabinet 90 and the cathode ray tube 1 of the CRT video display device 18 as shown in FIG. Since A is prominent, the user can more easily compare the boundary line A and the boundary line B if a raster rotation occurs due to the influence of geomagnetism when displaying in a letterbox size with a black belt. . Then, when the user recognizes the difference in inclination between the boundary line A and the boundary line B, the inclination of the video screen may be recognized.

  An object of the present invention is to provide a CRT video display device in which it is difficult to recognize the tilt of the video screen due to raster rotation.

  In order to solve the above problems, the invention described in claim 1 has a cathode ray tube that displays an image on a predetermined tube surface, and a frame portion that is located on the front side of the tube surface and surrounds the periphery of the tube surface. A CRT image display device comprising: a casing covering the cathode ray tube; an upper frame portion positioned above the tube surface in the frame portion; and a lower frame portion positioned below the tube surface in the frame portion. Is formed with an inclined surface that is a curved surface that is inclined toward the boundary with the tube surface in a direction facing each other, and the inclined surface has an outer periphery of the frame portion from the boundary with the tube surface A colored portion in which the color change in which black, which is substantially the same color as the black strip of the letter box displayed on the tube surface of the cathode ray tube, changes to a predetermined color of the frame portion gradually spreads in an arc shape It is characterized by being given.

  The invention described in claim 2 includes a cathode ray tube that displays an image on a predetermined tube surface, a housing that is positioned on the front side of the tube surface and surrounds the periphery of the tube surface, and that covers the tube. In the CRT video display device comprising: the upper frame portion located above the tube surface in the frame portion and the lower frame portion located below the tube surface in the frame portion in the direction facing each other. An inclined surface that is inclined toward the boundary with the tube surface is formed.

  According to a third aspect of the present invention, in the CRT video display device according to the second aspect, the inclined surface is a curved surface.

  According to a fourth aspect of the present invention, there is provided a cathode ray tube that displays an image on a predetermined tube surface, a casing that is located on the front side of the tube surface and surrounds the periphery of the tube surface, and covers the cathode ray tube. In the CRT video display device, the upper frame portion located above the tube surface in the frame portion and the lower frame portion located below the tube surface in the frame portion are bounded by the tube surface. A colored portion that gradually changes from a predetermined color of the frame portion toward black is provided.

  According to a fifth aspect of the present invention, in the CRT video display device according to the fourth aspect, the colored portion applied to the frame portion is formed from the upper frame portion and the lower frame portion, and the tube surface in the frame portion is It is given over the horizontal frame part located in a side.

  According to a sixth aspect of the present invention, in the CRT video display device according to the fourth or fifth aspect, the colored portion applied to the frame portion has a color change in an arc shape from a boundary with the tube surface in the frame portion. It is characterized by being spread.

  According to a seventh aspect of the present invention, in the CRT image display device according to any one of the fourth to sixth aspects, the black color in the colored portion applied to the frame portion is a letter displayed on the tube surface of the cathode ray tube. It is substantially the same color as the black belt of the box.

  According to the first aspect of the present invention, the CRT image display device can display an image on the tube surface of the cathode ray tube, and the upper frame portion and the lower frame portion in the frame portion surrounding the tube surface are mutually connected. Since the inclined surface is a curved surface that inclines toward the boundary with the pipe surface in the opposite direction, the upper frame part and the lower frame part are adjacent to the boundary with the pipe surface by a gentle curved surface gradient. Therefore, it is difficult for shadows due to steps or the like to occur at the boundaries. That is, the boundary between the upper frame portion and the lower frame portion and the tube surface does not stand out due to the shadow, and the boundary line between the frame portion and the tube surface is obscured.

  Further, on the inclined surface of the frame portion of the CRT image display device, black that is substantially the same color as the black belt of the letter box displayed on the tube surface of the CRT from the boundary with the tube surface toward the outer peripheral side of the frame portion. A colored portion in which a color change that changes to a predetermined color of the frame portion gradually spreads in an arc shape is provided.

  When the CRT video display device displays the letterbox size video, the black box of the letterbox is displayed on the tube surface adjacent to the upper frame portion and the lower frame portion. At the boundary with the surface, the black color of the colored part of the upper frame part and the lower frame part is aligned with the black color of the black belt displayed on the tube surface, making it difficult to visually recognize the boundary between the frame part and the tube surface The boundary line between the frame and the tube surface is obscured.

  In particular, the colored portion changes color from black of the black belt of the letterbox to a predetermined color of the frame so that the brightness and color change gradually in an arc shape from the boundary with the tube surface. Therefore, the border line between the frame portion and the tube surface can be obscured more than a sudden color change near the border.

  Therefore, in the CRT image display device, even when displaying images in a letterbox size with a black belt, due to the synergistic effect of the shape of the inclined surface of the frame portion and the colored portion applied to the inclined surface, It is possible to obscure the boundary line between the frame of the housing and the tube surface, and to make it difficult to recognize the tilt of the video screen due to raster rotation.

  According to the second aspect of the present invention, the CRT image display device can display an image on the tube surface of the cathode ray tube, and the upper frame portion and the lower frame portion in the frame portion surrounding the tube surface are mutually connected. Since an inclined surface that is inclined toward the boundary with the tube surface is formed in the opposite direction, the upper frame portion and the lower frame portion are adjacent to the boundary with the tube surface by a gentle gradient, and there is a step at the boundary. This makes it difficult for shadows to occur. That is, the boundary between the upper frame portion and the lower frame portion and the tube surface does not stand out due to the shadow, and the boundary line between the frame portion and the tube surface is obscured.

  Therefore, even when a CRT video display device performs video display in a letterbox size with a black belt, the boundary line between the frame of the casing and the tube surface is obscured, and the video screen is tilted by raster rotation. Can be difficult to recognize.

  According to the third aspect of the invention, it is needless to say that the same effect as that of the second aspect of the invention can be obtained, and since the inclined surface of the CRT image display device has a curved surface, the inclined surface is a gently curved surface. Due to the gradient, it is adjacent to the boundary with the tube surface, and shadows are less likely to occur at that boundary.

  Therefore, even in the case of displaying images in a letterbox size with a black belt in the CRT image display device, the boundary line between the frame portion of the casing and the tube surface is further obscured, and the image screen by raster rotation is The inclination can be made difficult to recognize.

  According to the fourth aspect of the present invention, the CRT image display device can display an image on the tube surface of the cathode ray tube, and the upper frame portion and the lower frame portion in the frame portion surrounding the tube surface are provided with a tube. A colored portion that gradually changes from a predetermined color of the frame toward black toward the boundary with the surface is applied.

  When the CRT video display device displays the letterbox size video, the black box of the letterbox is displayed on the tube surface adjacent to the upper frame portion and the lower frame portion. At the boundary with the surface, the black color of the colored part of the upper frame part and the lower frame part is aligned with the black color of the black belt displayed on the tube surface, making it difficult to visually recognize the boundary between the frame part and the tube surface The boundary line between the frame and the tube surface is obscured.

  In particular, the colored part changes color from black to a predetermined color in the frame so that the brightness and color change gradually from the boundary with the tube surface, so abrupt color changes near the boundary As compared with the above, the boundary line between the frame portion and the tube surface can be made more ambiguous.

Therefore, even when a CRT video display device performs video display in a letterbox size with a black belt, the boundary line between the frame of the casing and the tube surface is obscured, and the video screen is tilted by raster rotation. Can be difficult to recognize.

  According to the fifth aspect of the invention, it is needless to say that the same effect as that of the fourth aspect of the invention can be obtained, and the colored portions applied to the frame portion of the CRT video display device are the upper frame portion and the lower frame portion. Since it is applied from the frame part to the horizontal frame part located on the side of the tube surface in the frame part, the vicinity of the corner in the tube surface where the upper frame part or the lower frame part intersects the horizontal frame part In this case, the boundary line between the frame portion and the tube surface is easily obscured. Therefore, even in the case of displaying images in a letterbox size with a black belt in the CRT image display device, the boundary line between the frame portion of the casing and the tube surface is further obscured, and the image screen by raster rotation is The inclination can be made difficult to recognize.

  According to the invention described in claim 6, it is needless to say that the same effect as that of the invention described in claim 4 or 5 can be obtained, and the colored portion applied to the frame portion of the CRT image display device is the frame portion. Since the color change extends in a circular arc shape from the boundary with the tube surface, it can be difficult to visually recognize that the boundary line between the frame portion and the tube surface is linear. And the boundary line of a frame part and a pipe surface is obscured. Therefore, even in the case of displaying images in a letterbox size with a black belt in the CRT image display device, the boundary line between the frame portion of the casing and the tube surface is further obscured, and the image screen by raster rotation is The inclination can be made difficult to recognize.

  According to the invention described in claim 7, it is needless to say that the same effect as that of the invention described in any one of claims 4 to 6 can be obtained, and the colored portion applied to the frame portion of the CRT video display device. The black color in the box is substantially the same color as the black strip of the letterbox displayed on the tube surface of the cathode ray tube. Therefore, when the letterbox size image is displayed on the CRT image display device, the boundary between the frame portion and the tube surface is displayed. Is difficult to visually recognize, and the boundary line between the frame portion and the tube surface is obscured. Therefore, even in the case of displaying images in a letterbox size with a black belt in a CRT image display device, the boundary line between the frame portion of the casing and the tube surface is further obscured, and a minute image by raster rotation is used. It is possible to make it difficult to recognize the tilt of the screen.

  Embodiments of a CRT video display apparatus according to the present invention will be described below in detail with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the CRT video display device 11 includes a cathode ray tube 1 that displays an image, a cabinet 20 that is a casing that covers the cathode ray tube 1, and the like.

  The CRT video display device 11 includes a receiving unit (not shown), an input unit (not shown) that receives an input of a video signal from the receiving unit or an external device, and a control unit (not shown) that controls operation processing of each part of the device. ).

  The cathode ray tube 1 has a predetermined tube surface 1a for displaying an image. Then, the cathode ray tube 1 displays an image based on an image signal input to an input unit (not shown) on the tube surface 1a.

  The cathode ray tube 1 is a well-known video display device that forms an image by outputting an electron beam based on a video signal and irradiating the electron beam against the fluorescent surface of the tube surface 1a.

  The cabinet 20 is provided on the front side of the tube surface 1a of the cathode ray tube 1 and includes a frame portion 2 surrounding the tube surface 1a, and covers the cathode ray tube 1 so as to be accommodated therein.

  The frame portion 2 is disposed so as to contact the tube surface 1 a of the cathode ray tube 1, and the frame portion 2 includes an upper frame portion 21 positioned above the tube surface 1 a in the frame portion 2 and a tube in the frame portion 2. It has the lower frame part 22 located under the surface 1a.

The upper frame portion 21 and the lower frame portion 22 are formed with inclined surfaces 21a and 22a that are inclined toward the boundary with the tube surface 1a. The inclined surfaces 21a and 22a are inclined toward the boundary with the tube surface 1a in directions facing each other, so that there is no sudden change in depth from the cabinet 20 to the tube surface 1a. Yes.

  As shown in FIG. 1, the cabinet 20 has no step at the boundary between the upper frame portion 21 and the lower frame portion 22 of the frame portion 2 and the tube surface 1a of the cathode ray tube 1, and at the boundary with the tube surface 1a. Since the adjacent inclined surfaces 21a and 22a have a gentle slope shape, it is difficult for a shadow due to a step to occur at the boundary.

  The receiving unit (not shown) has, for example, an antenna device, receives a predetermined video signal corresponding to the selected channel, and sends the received video signal to an input unit (not shown).

  An input unit (not shown) receives an input of a video signal from a receiving unit (not shown) or an external device such as a DVD player, and outputs the video signal to the cathode ray tube 1 by a control process of a control unit (not shown).

  In the case of the CRT video display device 11 having such a cabinet 20, since the shadow between the cabinet 20 and the tube surface 1a of the cathode ray tube 1 is hardly generated, the boundary between the cabinet 20 and the tube surface 1a is conspicuous. Without blurring the boundaries.

  Therefore, even when the CRT video display device 11 performs video display in a letterbox size with a black belt, the boundary line between the cabinet 20 and the tube surface 1a is obscured, and a minute video screen by raster rotation is displayed. The inclination can be made difficult to recognize.

(Embodiment 2)
Next, Embodiment 2 of the CRT video display device according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and only a different part is demonstrated.

  As shown in FIG. 2, the CRT video display device 12 includes a cathode ray tube 1 that displays an image, a cabinet 30 that is a casing that covers the cathode ray tube 1, and the like. The CRT video display device 12 includes a receiving unit (not shown), an input unit (not shown) that receives an input of a video signal from the receiving unit or an external device, and a control unit (not shown) that controls operation processing of each unit. ).

  The cabinet 30 is provided on the front side of the tube surface 1a of the cathode ray tube 1 and includes a frame portion 3 surrounding the tube surface 1a so as to accommodate the cathode ray tube 1 therein.

  The frame portion 3 is disposed so as to contact the tube surface 1 a of the cathode ray tube 1, and the frame portion 3 includes an upper frame portion 31 positioned above the tube surface 1 a in the frame portion 3 and a tube in the frame portion 3. It has the lower frame part 32 located under the surface 1a.

  The upper frame portion 31 and the lower frame portion 32 are formed with inclined surfaces 31a and 32a that are inclined toward the boundary with the tube surface 1a, respectively. The inclined surfaces 31a and 32a are inclined toward the boundary with the tube surface 1a in directions facing each other. In particular, the inclined surfaces 31a and 32a are curved surfaces having a convex surface on the surface side. Yes. And it does not become a sudden depth change from the cabinet 30 to the pipe surface 1a.

  As shown in FIG. 2, the cabinet 30 has no step at the boundary between the upper frame portion 31 and the lower frame portion 32 of the frame portion 3 and the tube surface 1a of the cathode ray tube 1, and at the boundary with the tube surface 1a. Since the adjacent inclined surfaces 31a and 32a have a gentle curved surface gradient, a shadow due to a step is less likely to occur at the boundary.

In the case of the CRT image display device 12 having such a cabinet 30, since the shadow is less likely to occur at the boundary between the cabinet 30 and the tube surface 1a of the CRT 1, the boundary between the cabinet 30 and the tube surface 1a is defined. The boundary can be obscured without making it stand out. Further, since the inclined surfaces 31a and 32a of the cabinet 30 have a gentle curved surface gradient, the reflected light reflected on the surfaces of the inclined surfaces 31a and 32a is obscured by scattering or the like, and the boundary can be obscured.

  Therefore, even when the CRT video display device 12 performs video display in a letterbox size with a black belt, the boundary line between the cabinet 30 and the tube surface 1a is obscured, and a minute video screen by raster rotation is displayed. The inclination can be made difficult to recognize.

(Embodiment 3)
Next, Embodiment 3 of the CRT video display apparatus according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and only a different part is demonstrated.

  As shown in FIG. 3, the CRT video display device 13 includes a cathode ray tube 1 that displays an image, a cabinet 40 that is a casing that covers the cathode ray tube 1, and the like. The CRT video display device 13 includes a receiving unit (not shown), an input unit (not shown) that receives an input of a video signal from the receiving unit or an external device, and a control unit (not shown) that controls operation processing of each part of the device. ).

  The cabinet 40 is provided on the front side of the tube surface 1a of the cathode ray tube 1 and includes a frame portion 4 surrounding the tube surface 1a, and covers the cathode ray tube 1 so as to be accommodated therein.

  The frame portion 4 is disposed so as to contact the tube surface 1 a of the cathode ray tube 1, and the frame portion 4 includes an upper frame portion 41 positioned above the tube surface 1 a in the frame portion 4 and a tube in the frame portion 4. It has the lower frame part 42 located under the surface 1a.

  The upper frame portion 41 and the lower frame portion 42 are gradually changed in brightness and color from a predetermined color of the frame portion 4 toward the boundary from the outer peripheral side of the frame portion 4 to the tube surface 1a to black. A changing colored portion 44 is provided. The black color in the colored portion 44 is substantially the same color as the black black color of the letter box displayed on the tube surface 1 a of the CRT 1.

  Note that the term “substantially the same color” as used herein refers to a color that has a slight color difference but does not feel the color difference at a glance. The black color in the colored portion 44 is preferably the same color as the black color of the black box of the letter box, but the tube surface 1a of the CRT 1 and the surface of the frame portion 4 are completely different because of the difference in material texture. It is difficult to make the same color. For this reason, the black color of the colored portion 44 may be substantially the same color as the color difference of the black color of the letter box displayed on the tube surface 1a is hardly felt.

  The upper frame portion 41 and the lower frame portion 42 have inclined surfaces 41a and 42a that are inclined toward the boundary with the tube surface 1a, respectively, so that the depth from the cabinet 40 to the tube surface 1a does not change suddenly. Is formed. That is, the coloring portion 44 is provided on the inclined surfaces 41a and 42a.

  The colored portion 44 may be formed by painting a paint on the cabinet 40, or may be formed by attaching a colored film or the like to the cabinet 40. Further, the colored portion 44 may be provided when the cabinet 40 is molded.

  In this manner, the upper frame portion 41 and the lower frame portion 42 of the cabinet 40 have a predetermined color of the frame portion 4 from the outer peripheral side of the frame portion 4 toward the boundary with the tube surface 1a as shown in FIG. Since a colored portion 44 having a gradation gradually changing from black to black is applied, a black strip of letterbox is formed on the tube surface 1a adjacent to the boundary with the frame portion 4 (upper frame portion 41, lower frame portion 42). Is displayed, the boundary line between the cabinet 40 (frame portion 4) and the tube surface 1a can be obscured.

Further, the cabinet 40 has no step at the boundary between the upper frame portion 41 and the lower frame portion 42 of the frame portion 4 and the tube surface 1a of the CRT 1, and the inclined surface 41a adjacent to the boundary with the tube surface 1a,
Since 42a becomes a gentle slope shape, it is hard to produce a shadow in the boundary.

  That is, in the case of the CRT image display device 13 including such a cabinet 40, when a black box of a letter box is displayed on the tube surface 1a of the cathode ray tube 1, the colored portions 44 of the upper frame portion 41 and the lower frame portion 42 are displayed. Since black and black of the black belt displayed on the tube surface 1a are adjacent to each other, it becomes difficult to visually recognize the boundary between the frame portion 4 and the tube surface 1a, so that the cabinet 40 (frame portion 4) and the tube surface 1a The boundary line can be obscured. Further, since a shadow due to a step is less likely to occur at the boundary between the cabinet 40 and the tube surface 1a of the cathode ray tube 1, the boundary between the cabinet 40 and the tube surface 1a can be further obscured.

  Therefore, even when the CRT video display device 13 performs video display in a letterbox size with a black belt, the boundary line between the cabinet 40 and the tube surface 1a is obscured, and a minute video screen by raster rotation is displayed. The inclination can be made difficult to recognize.

(Embodiment 4)
Next, Embodiment 4 of the CRT video display device according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 1, and only a different part is demonstrated.

  As shown in FIG. 4, the CRT video display device 14 includes a cathode ray tube 1 that displays an image, a cabinet 50 that is a casing that covers the cathode ray tube 1, and the like. The CRT video display device 14 includes a receiving unit (not shown), an input unit (not shown) that receives an input of a video signal from the receiving unit or an external device, and a control unit (not shown) that controls operation processing of each part of the device. ).

  The cabinet 50 is provided on the front side of the tube surface 1a of the cathode ray tube 1 and includes a frame portion 5 surrounding the tube surface 1a, and covers the cathode ray tube 1 so as to be accommodated therein.

  The frame portion 5 is disposed so as to contact the tube surface 1 a of the cathode ray tube 1, and the frame portion 5 includes an upper frame portion 51 positioned above the tube surface 1 a in the frame portion 5 and a tube in the frame portion 5. It has the lower frame part 52 located under the surface 1a, and the horizontal frame parts 53 and 54 located in the frame part 5 at the side of the pipe surface 1a.

  The upper frame portion 51, the lower frame portion 52, and the horizontal frame portions 53 and 54 gradually change in brightness and color from the boundary with the tube surface 1a toward the outer peripheral side of the frame portion 5, and from black to the frame portion 5 A colored portion 55 is provided in which the color change that changes to a predetermined color gradually spreads in an arc shape. The black color in the colored portion 55 is preferably the same color as the black color of the black color of the letterbox displayed on the tube surface 1a of the CRT 1, but the black color in the colored portion 55 and the black color on the tube surface 1a are preferred. What is necessary is just the substantially same color which has the slight color difference of the grade which hardly feels a color difference with the black of a belt | band | zone.

  Further, the upper frame portion 51, the lower frame portion 52, and the horizontal frame portions 53 and 54 are curved toward the boundary with the tube surface 1a so that there is no sudden change in depth from the cabinet 50 to the tube surface 1a. Inclined surfaces 51 a, 52 a, 53 a, 54 a that are inclined while forming are formed. That is, the frame part 5 of the cabinet 50 has a mortar shape inclined from the outer peripheral side toward the boundary with the tube surface 1a.

  And the coloring part 55 is given over the horizontal frame parts 53 and 54 from the upper frame part 51 and the lower frame part 52, and the coloring part 55 is substantially elliptical on the inclined surfaces 51a, 52a, 53a, 54a. It has been given a shape. The colored portion 55 may be formed by painting a paint on the cabinet 50 or may be formed by attaching a colored film or the like to the cabinet 50. Further, the colored portion 55 may be provided when the cabinet 50 is formed.

As described above, the frame 5 of the cabinet 50 has letterboxes displayed on the tube surface 1a of the CRT 1 from the boundary with the tube surface 1a toward the outer peripheral side of the frame 5 as shown in FIG. Since the colored portion 55 is provided with a gradation in which a color change in which black, which is substantially the same color as the black belt, changes to a predetermined color of the frame portion 5 is gradually expanded in an arc shape, the frame portion 5 is provided. When a black box of a letterbox is displayed on the tube surface 1a adjacent to the boundary with the (upper frame portion 51, lower frame portion 52), the boundary line between the cabinet 50 (frame portion 5) and the tube surface 1a is ambiguous. Can be In particular, since the color change extends in an arc shape from the boundary with the tube surface 1a, it is difficult to visually recognize that the boundary line between the frame portion 5 and the tube surface 1a is linear.

  Further, the cabinet 50 has no step at the boundary between the upper frame portion 51, the lower frame portion 52, the horizontal frame portions 53 and 54 in the frame portion 5, and the tube surface 1a of the CRT 1, and the boundary with the tube surface 1a. Since the inclined surfaces 51a, 52a, 53a and 54a adjacent to each other have a slope shape with a gentle curved surface, it is difficult for shadows due to steps to occur at the boundaries.

  That is, in the case of the CRT image display device 14 having such a cabinet 50, when a black box of a letter box is displayed on the tube surface 1a of the cathode ray tube 1, the colored portions 55 of the upper frame portion 51 and the lower frame portion 52 are displayed. Since the black color and the black black color displayed on the tube surface 1a are adjacent to each other, it becomes difficult to visually recognize the boundary between the frame portion 5 and the tube surface 1a. Therefore, the cabinet 50 (frame portion 5) and the tube surface 1a The boundary line can be obscured. Further, since a shadow due to a step is hardly generated at the boundary between the cabinet 50 and the tube surface 1a of the CRT 1, the boundary between the cabinet 50 and the tube surface 1a can be further obscured.

  Therefore, even when the CRT image display device 14 displays an image in a letterbox size with a black belt, the boundary line between the cabinet 50 and the tube surface 1a is obscured, and a minute image screen by raster rotation is displayed. The inclination can be made difficult to recognize.

  Further, as shown in FIG. 5, a plurality of random oblique lines are provided in the vicinity of the boundary with the tube surface 1a in the frame portion 6 of the cabinet 60 of the CRT video display device 15 so as to border the inner peripheral side of the frame portion 6. You may give a pattern.

  Thus, by giving a plurality of random oblique lines near the boundary between the frame 6 and the tube surface 1a, the boundary between the cabinet 60 (frame 6) and the tube surface 1a can be obscured.

  Therefore, even when the CRT image display device 15 displays an image in a letterbox size with a black belt, the boundary line between the cabinet 60 and the tube surface 1a is obscured, and a minute image screen by raster rotation is displayed. The inclination can be made difficult to recognize.

  The pattern applied to the frame portion 6 may be a mesh-like (net-like) pattern with a plurality of oblique lines.

  In addition, the design and decorativeness of the frame 6 can be improved by a pattern with diagonal lines applied to the frame 6.

  Further, as shown in FIG. 6, the frame portion 7 (cabinet 70) is formed so that the boundary between the frame portion 7 of the cabinet 70 of the CRT video display device 16 and the tube surface 1a is a wavy curve. Also good.

  Thus, by making the boundary part with the pipe surface 1a in the frame part 7 into a wavy curve, the boundary line between the frame part 7 and the pipe surface 1a can be made ambiguous. In other words, when a letterbox with a black band is displayed on the CRT 1, the frame part 7 is compared with the boundary line (boundary line B; see FIG. 7) between the black band and the actual video area on the video screen. Since the boundary line (border line A; see FIG. 7) between the tube surface 1a and the tube surface 1a is obscured, it is difficult to recognize the inclination of the boundary line (B) of the video screen.

  Therefore, even when the CRT image display device 16 displays an image in a letterbox size with a black belt, the boundary line between the cabinet 70 and the tube surface 1a is obscured, and a minute image screen by raster rotation is displayed. The inclination can be made difficult to recognize.

  The wavy curve formed in the frame portion 7 is preferably a random wave shape rather than a regular wave shape.

  Further, the boundary portion in the frame portion 7 is not formed into a wavy curve, but the boundary portion in the frame portion 7 is made non-linear by forming a relief or the like according to a desired pattern or design on the boundary portion. The boundary line between the frame portion 7 and the tube surface 1a may be made ambiguous.

  In addition, the design and decorativeness of the frame 7 can be improved by a curved portion or a relief applied to the frame 7.

  In the above embodiment, the curved surface applied to the inclined surface is a convex surface, but the present invention is not limited to this, and the curved surface of the inclined surface may be a concave surface.

  Further, in the above embodiment, the color change in the colored portion applied to the frame portion gradually spreads in an arc shape or a substantially elliptic shape from the boundary with the tube surface 1a toward the outer peripheral side of the frame portion. The present invention is not limited to this, and the shape in which the color change spreads may be any shape.

  Further, the color change in the colored portion applied to the frame portion is changed from black to a predetermined color of the frame portion, but the present invention is not limited to this, and changes from black to any color. It may be. Further, according to the color of the band portion in the letterbox size display, the color change from the color of the band portion may be performed.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

It is a sectional view side view of the CRT picture display device in Embodiment 1 of the present invention. It is a sectional view side view of the CRT picture display device in Embodiment 2 of the present invention. It is a front view of the CRT video display device in Embodiment 3 of the present invention. It is a front view of the CRT image display apparatus in Embodiment 4 of this invention. It is a front view of the CRT video display device in other embodiments of the present invention. It is a front view of the CRT video display device in other embodiments of the present invention. It is a front view of a conventional CRT video display device, and is an explanatory diagram when displaying in a letterbox size with a black belt in the CRT video display device. It is a sectional view side view of the conventional CRT image display apparatus.

Explanation of symbols

1 CRT 1a Tube surface 2, 3, 4, 5, 6, 7 Frame 20, 30, 40, 50, 60, 70 Cabinet (housing)
21, 31, 41, 51 Upper frame portion 21a, 31a, 41a, 51a Inclined surface 22, 32, 42, 52 Lower frame portion 22a, 32a, 42a, 52a Inclined surface 53, 54 Horizontal frame portion 53a, 54a Inclined surface 11 , 12, 13, 14, 15, 16 CRT video display device 44, 55 Coloring section

Claims (7)

A cathode ray tube that displays an image on a predetermined tube surface;
In a CRT video display device comprising: a frame portion that is positioned on the front side of the tube surface and surrounds the periphery of the tube surface, and covers the cathode ray tube.
The upper frame portion positioned above the tube surface in the frame portion and the lower frame portion positioned below the tube surface in the frame portion are inclined toward the boundary with the tube surface in directions facing each other. An inclined surface that is a curved surface is formed, and the inclined surface has a letterbox that is displayed on the tube surface of the CRT from the boundary with the tube surface toward the outer peripheral side of the frame portion. A CRT video display device, wherein a color change in which black, which is substantially the same color as a black belt, changes to a predetermined color of the frame portion, is provided with a colored portion that gradually spreads in an arc shape. A cathode ray tube that displays an image on a predetermined tube surface;
In a CRT video display device comprising: a frame portion that is positioned on the front side of the tube surface and surrounds the periphery of the tube surface, and covers the cathode ray tube.
The upper frame portion positioned above the tube surface in the frame portion and the lower frame portion positioned below the tube surface in the frame portion are inclined toward the boundary with the tube surface in directions facing each other. A CRT image display device characterized in that an inclined surface is formed.   The CRT image display apparatus according to claim 2, wherein the inclined surface is a curved surface. A cathode ray tube that displays an image on a predetermined tube surface;
In a CRT video display device comprising: a frame portion that is positioned on the front side of the tube surface and surrounds the periphery of the tube surface, and covers the cathode ray tube.
An upper frame portion positioned above the tube surface in the frame portion, and a lower frame portion positioned below the tube surface in the frame portion, the predetermined portion of the frame portion toward the boundary with the tube surface A CRT video display device, characterized in that a colored portion gradually changing from color to black is applied.   The colored portion applied to the frame portion is provided from the upper frame portion and the lower frame portion to a horizontal frame portion located on a side of the tube surface in the frame portion. The CRT video display device according to claim 4.   6. The CRT image according to claim 4, wherein the colored portion applied to the frame portion is applied so that a color change spreads in an arc shape from a boundary with the tube surface in the frame portion. Display device.   7. The black color in the colored portion applied to the frame portion is substantially the same color as a black belt of a letter box displayed on the tube surface of the cathode ray tube. CRT video display device.