JPH01284180A - Bezel fitting device for cathode-ray tube - Google Patents

Abstract

PURPOSE:To surely attain the alignment between a bezel and a cathode-ray tube, to simplify work for fitting the bezel and the cathode-ray tube together, and to assemble the small-sized cathode ray-tube with the bezel by providing an elastic cylindrical support to be fixedly fit in the taper part of the funnel part of the cathode-ray tube and the bezel with a sleeve having a sleeve part to be extrapolated on the elastic cylindrical support for the device. CONSTITUTION:While a support 20 to be extrapolated on a cathode-ray tube 10 and hold the cathode-ray tube 10 is composed into the elastic cylindrical support to be fixedly fit in the neck part of a funnel part 12 of the cathode-ray tube 10, a sleeve part 31 to be extrapolated on the support 20 and fit a bezel 30 to the cathode-ray tube 10 is composed so that the sleeve part 31 can be elastically and fixedly fit through a locking claw 24 and a locking hook 40 to the support 20. Thus, the alignment between the bezel and the cathode-ray tube can be surely and automatically attained at the time of fitting the bezel and the cathode-ray tube together, the structure of the cathode-ray tube with the bezel can be widely simplified, and simultaneously, the cathode-ray tube with the bezel can be assembled into the one having a small size even when either dispersion or unevenness occurs in either the diameter or the shape of the rear of the funnel part of the cathode-ray tube.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bezel mounting device for a small cathode ray tube (hereinafter referred to as CRT) used in a viewfinder of a television camera, etc.

[Conventional technology]

In general, storing the CRT in the viewfinder is
This is done by attaching a bezel to the ill image plane of T and fixing this bezel within the viewfinder casing. Note that the bezel fixes the CRT inside the casing, and also fixes the CRT in the casing and connects the #
It is also used to trim both sides of the i image plane.

Conventionally, such a CRT bezel mounting device usually includes an appropriate cylindrical holder attached to the funnel side of the CRT, and a sleeve to be fitted over the holder on the bezel side. The sleeves were configured to be connected by screwing or gluing.

[Problem to be solved by the invention]

However, the conventional mounting device as described above has several problems as described below.

That is, in general, the funnel portion of this type of small CRT usually has variations in diameter in each part, and also often has an axially asymmetrical and irregular shape, so in the conventional mounting device of this type, First, misalignment of the axes between the holder and the CRT occurs, making it impossible to achieve alignment between the window frame of the bezel and the imaging surface of the CRT, and second, the gap between the holder and the funnel. As a result, rocking or vibration occurs in the CRT. This impedes the overall function and life of the viewfinder, and also makes it impossible to properly crop the screen. Next, the sleeve is a CRT
is inserted onto the holder from the front surface of the CRT, so the outer diameter of both is larger than that of the CRT, but especially when the two are screwed together, the outer diameter of both is larger than that of the CRT. A large diameter is required, which complicates the structure and at the same time increases the size of the casing and thus the entire viewfinder. Furthermore, this type of mounting device is generally complicated to assemble and requires relatively skill.

Therefore, it is an object of the present invention to reliably achieve alignment between a bezel and a CRT, to prevent rocking or vibration of the CRT, and to provide a structure that is simple and easy to assemble and is compact. An object of the present invention is to provide a bezel mounting device for a cathode ray tube.

[Means to solve the problem]

In order to achieve the above object, the cathode ray tube bezel mounting device according to the present invention includes an elastic cylindrical holder having a tapered portion on the inner peripheral surface of one end edge and fitted into the tapered portion of the funnel portion of the cathode ray tube; (It consists of a bezel part and a bezel with a sleeve, which is provided with a sleeve part that protrudes from the back surface of the bezel part and is fitted onto the elastic cylindrical holder, and is placed at a predetermined position on the outer peripheral surface of the elastic cylindrical holder. A pair of diametrically opposed locking claws are provided so as to be elastically displaceable radially inward, and a pair of locking hooks are provided at predetermined positions corresponding to the locking claws on the wall surface of the sleeve portion radially outward. It is characterized in that it is provided so as to be elastically displaceable.

In this case, the elastic cylindrical holder has a thinner wall thickness in the axial direction passing through the locking pawl, and the overall wall thickness is increased toward the end facing the tapered portion and around the radial direction perpendicular to the locking pawl. In addition, the locking hook of the sleeve part of the sleeved bezel is formed by drilling a locking hole in a hook piece that is formed by dividing the sleeve wall surface through an axial groove. It is preferable to configure it by setting it up.

(Function) The tapered end portion of the elastic cylindrical holder is elastically fitted into the neck of the funnel portion with relatively little variation or irregularity in diameter or shape. Therefore, the bezel inserted into the holder via the sleeve portion is reliably and automatically aligned with the CRT. Furthermore, no rocking or vibration is generated in the CRT. Further, since the locking hook of the sleeve portion and the locking pawl of the holder are elastically displaced in opposite directions synergistically, both can be easily and easily inserted into the sleeve portion. Therefore, the work of assembling the mounting device can be performed simply and easily. Further, since the locking pawl projects only slightly from the outer surface of the sleeve portion, the casing and therefore the entire viewfinder are configured to be compact.

〔Example〕

Next, one embodiment of a cathode ray tube bezel mounting device according to the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, the cathode ray tube bezel mounting device according to the present invention is composed of an elastic cylindrical holder 20 and a sleeved bezel 30. As shown in FIG.

As shown in FIGS. 3 to 6, the elastic cylindrical holder 20 has a funnel portion 12 of CRTlo on the inner peripheral surface of one end edge.
It has a tapered part 22 that is fitted into the tapered part of the neck, and has a pair of diametrically opposed locking claws 24, 24 at predetermined positions on the outer peripheral surface, and is integrally molded from an elastic material such as rubber. Ru. Further, the elastic cylindrical holder 20 is formed with long grooves 26, 26 having a width larger than the width of the locking claws on the inner circumferential surface in the axial direction passing through the locking claws 24, 24, and furthermore, the overall wall thickness is It is formed so that it becomes gradually thinner toward the end facing the tapered portion 22 and toward the circumferential surface perpendicular to the locking claw 24 in the radial direction (see FIG. 4). .24 is configured to be elastically displaceable inward in the radial direction, as shown by the arrow in FIG.

As shown in FIGS. 7 to 9, the sleeved bezel 30 includes a bezel portion 32 and a sleeve portion 34 that projects from the back surface of the bezel portion 32 in a cylindrical shape. Bezel part 3
2, as will be explained in detail later, CR the window frame 36 part.
It is attached to the CRTlo in close contact with the image carrying surface 14 of the Tlo, and its flange 32a is fitted and fixed into a fixing groove provided in the casing (not shown) of the viewfinder, so that the CRTlo is configured to be stored in a predetermined position within the casing.

Note that the window frame 36 is used to trim the screen on the image transport plane 14. The sleeve portion 34 has an inner shape approximately equal to the outer diameter of the holder 20, and has a pair of hook pieces 4 diametrically opposed to each other via a groove 38 on its wall surface.
0.40 is formed. At predetermined positions of these hook pieces 40, 40, locking holes 42, 42 into which the locking claws 24, 24 on the holder 20 are inserted are bored.
．． An inclined guide surface 408.40a is formed at the inner end of 40. Since the sleeved bezel 30 is molded from a plastic material, the hook pieces 40.40 have flexibility, and when attaching the sleeve portion 34 to the holder 20, which will be described later, the hook pieces 40. As shown by the two-dot chain line in the figure, it is elastically deformed outward in the radial direction.

Next, the assembly of the cathode ray tube bezel mounting device of the present invention having such a configuration will be explained with reference mainly to FIG. When assembling, first, the elastic cylindrical holder 20 is inserted and fitted into the funnel portion 12 of the CRTIO in parallel to the axial direction. In this case, the tapered portion 22 of the holder 20 is elastically fitted to the neck portion of the funnel portion 12 where variations or irregularities in diameter and shape are less likely to occur.
There are variations in diameter and shape in the rear part of the.

Even if there is any misalignment, the holder 20 is held on the CRTIO in a state where it is reliably aligned with the axis of the CRTlo. Next, the sleeve portion 34 of the sleeved bezel 30 is inserted into the holder 20 with the respective locking holes 42 and locking claws 24 aligned in the axial direction. In this case, hook piece 4
Since the guide surface 40a of 0 comes into contact with the guide surface 24a of the locking pawl 24, the hook piece 40 is elastically displaced radially outward, and at the same time the locking pawl 24 is elastically displaced radially inward.
As a result, the locking pawl 24 is smoothly inserted into the locking hole 42. Then, the hook piece 40 and the locking pawl 24 are each elastically returned to their original positions. In this manner, the sleeved bezel 30 is elastically assembled onto the CRTIO via the holder 20. Since the holder 20 is concentrically and elastically held with respect to the CRT10, the sleeve part 34 assembled in this manner is similarly held concentrically and elastically with respect to the CRT10. Ru. Therefore, when the flange portion 32a of the bezel portion 32 is fixed in a predetermined position to the casing of the viewfinder, the CRTlo is reliably housed in a predetermined position within the casing without rocking or vibration.

Note that the locking claws 24 and the locking holes 42 are provided at predetermined relative positions, so that the window frame 36 of the bezel portion 32 remains in close contact with the imaging surface 14 of the CRTlo and is stable in the predetermined relative position. Of course, they are held in contact with each other in this state.

As described above, according to the cathode ray tube bezel mounting device of the present invention, alignment between the bezel and the CRT can be achieved reliably and automatically, and rocking or vibration of the CRT can be reliably prevented. In addition, the assembly work can be done simply and easily. Furthermore, compared to conventional screwing methods, the structure can be made much simpler and more compact.

Although the present invention has been described above with reference to preferred embodiments, the present invention can be modified in many ways without departing from its spirit. For example, the number of locking pawls and locking hooks is not limited to two as in the embodiment, but may be three or more.

〔Effect of the invention〕

As explained above, in the cathode ray tube bezel mounting device according to the present invention, the holder that is fitted onto and holds the cathode ray tube is configured as an elastic cylindrical holder that is fitted into the funnel neck of the cathode ray tube. At the same time, the sleeve part that is inserted over the holder and attaches the bezel to the cathode ray tube is configured to be elastically attached to the holder via the locking pawl and the locking hook, so that the funnel of the cathode ray tube can be attached easily. Even if there are diameter or shape variations or irregularities in the rear part of the bezel, alignment between the bezel and the cathode ray tube can be achieved reliably and automatically when attaching the silk, and the rocking or vibration of the cathode ray tube can be ensured. can be prevented. Also,
Assembly work can be performed simply and easily. Furthermore, compared to the conventional screw-based assembly method, the structure can be made much simpler and the shape can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the cathode ray tube bezel mounting device according to the present invention, and FIG. 2 shows the cathode ray tube bezel mounting device according to the present invention shown in FIG. 1 in an assembled state. an axial sectional view through the locking pawl and the locking hook;
3 and 4 are respectively a front view and a back view of the elastic cylindrical holder shown in FIG. 1, and FIGS. 5 and 6 are sectional views taken along lines V-V and Vl-Vl in FIG. 3, respectively; 7 and 8 are a front view and a back view, respectively, of the sleeved bezel shown in FIG. 1, and FIG. 9 is a sectional view taken along the line IX-IX in FIG. 8. 10...CRT 12...Funnel portion 14...Ill image surface 20...Elastic cylindrical holder 22...Tapered portion 24...Locking claw 24
a... Inclined guide surface 26... Long groove 30... Bezel with sleeve 32... Bezel part 32a... Flange part 34...
・Sleeve part 36... Window frame 38... Division groove
40... Hook piece 42... Locking hole FIG, 7 FIG, 9 CN mEO. L ko〉] “゛; 〉” Tadashi

Claims (3)

[Claims] (1) an elastic cylindrical holder having a tapered portion on the inner circumferential surface of one end edge and fitted into the tapered portion of the funnel portion of the cathode ray tube;
It consists of a bezel part and a sleeved bezel that is provided with a sleeve part that protrudes from the back surface of the bezel part and is fitted onto the elastic cylindrical holder, and the bezel has a diameter at a predetermined position on the outer peripheral surface of the elastic cylindrical holder. A pair of locking claws are provided facing each other and are elastically displaceable toward the inner side in the radial direction, and a pair of locking hooks are provided at predetermined positions corresponding to the locking claws on the wall surface of the sleeve portion and facing outward in the radial direction. A bezel mounting device for a cathode ray tube, characterized in that the bezel mounting device is configured to be elastically displaceable. (2) The elastic cylindrical holder has a thin wall thickness in the axial direction passing through the locking pawl, and the overall wall thickness extends toward the end facing the tapered portion and at the circumference perpendicular to the radial locking pawl. A cathode ray tube bezel mounting device that is formed so that the wall becomes gradually thinner toward the surface. (3) A bezel mounting device for a cathode ray tube in which the locking hook of the sleeve portion of the sleeved bezel is formed by drilling a locking hole in a hook piece that is formed by dividing the sleeve wall surface through an axial groove.