JPH0533106Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for holding a cathode ray tube (CRT) of an electronic viewfinder (EVF) attached to, for example, a video camera.

[Summary of the invention] This invention consists of a first holder that fits and holds the tube side of a cathode ray tube for viewfinder, which has an inverted conical tube side and a cylindrical body side; a second holder that is in contact with the cathode ray tube and that fits and holds the inverted conical tapered surface side of the cathode ray tube;
In a viewfinder cathode ray tube holding device having a holder, a second holder, and a case for storing the cathode ray tube, a rectangular and an arcuate shape abutting each other on each side of the abutting portion of the first holder and the second holder are provided. The flange portions are integrally formed to protrude, and a pair of lock portions that engage with each other are integrally formed on the upper and lower sides of the contact portions of the first holder and the second holder. holder and second
The cathode ray tube is easily and securely positioned and held in the case by forming a pair of fitting grooves in which the rectangular and arc-shaped flanges that abut each other on both sides of the holder fit into each other. It has been made possible to do so.

[Prior Art] For example, a video camera is equipped with an electronic viewfinder (EVF) that allows you to check images while recording. This is the 8th,
To explain in detail with reference to FIG. 9, reference numeral 1 denotes a video camera, and an electronic viewfinder 2 is attached to the top surface of the main body of the video camera 1. This electronic viewfinder 2 is housed inside a pair of upper and lower cases 3 and 4, and a cathode ray tube (CRT) with a black and white screen.
5, and an eyepiece versi 6 having an eyecup 6a fitted to one end surface of the pair of cases 3 and 4 on the tube surface 5a side of the cathode ray tube 5.

As shown in FIGS. 9 and 10, the cathode ray tube 5 is mounted and held at a predetermined position in the lower case 4 by a cathode ray tube holding device. Specifically, the cathode ray tube 5 has a tube surface 5a having an inverted conical shape (this tapered surface is indicated by reference numeral 5b), and a body portion 5c.
is formed into a cylindrical shape. The tube surface 5a side of the cathode ray tube 5 is held by a cylindrical first holder 7A having an annular flange 7a protruding from the front end periphery.
The inverted conical tapered surface 5b side is fitted and held by a cylindrical second holder 7B. That is, the outer circumferential surface of the first holder 7A and the inner circumferential surface of the second holder 7B are respectively provided with threaded portions, and the flange portion 7a of the first holder 7A is in contact with the front end surface of the second holder 7B. The tube surface 5a side of the cathode ray tube 5 is fitted and held between both holders 7A and 7B by tightening and screwing the screw portion of the first holder 7A into the screw portion of the second holder 7B until they touch each other. . In this state, the flange 7a of the first holder 7A is inserted into the positioning groove 4a formed in the lower case 4, and the body 5c of the cathode ray tube 5 is fixed to the lower case 4. By fitting the upper case 3 to the lower case 4 with screws, the cathode ray tube 5 is held and installed in the pair of upper and lower cases 3 and 4 via the respective holders 7A, 7B, and 8. ing. In addition, the reference numeral 9 in FIGS. 9 and 10 indicates a cathode ray tube 5.
This is a deflection coil that deflects the screen on the tube surface 5a.

[Problems to be solved by the invention] However, since the tube surface 5a side of the cathode ray tube 5 is held by tightening the screw portions of the first holder 7A and the second holder 7B, , due to variations in the dimensions of the threads of the threaded portions of the first holder 7A and second holder 7B, these holders 7A and 7B are screwed together to fit and hold the tube surface 5a side of the cathode ray tube 5. Even if both holders 7A, 7B and the tube surface 5 of the cathode ray tube 5
a and the tapered surface 5b, which makes it easy for the holders 7A and 7B to rattle.
There was a drawback that the cathode ray tube 5 ran idly between the two. As a result, there was a problem in that the task of positioning the screen of the cathode ray tube 5 within a predetermined value of the standard horizontal line became complicated.

In addition, since the flange 7a of the first holder 7A is also formed in an annular shape, the first holder 7A and the second holder 7B can fit and hold the tube surface 5a of the cathode ray tube 5. When inserting and positioning the flange 7a into the groove 4a of the lower case 4, the first
The holder 7A tends to rotate idly, making it even more difficult to position and mount the cathode ray tube 5 in a horizontal position within the standard values.

Therefore, the present invention provides a cathode ray tube holding device of a viewfinder that can easily and reliably position and attach a cathode ray tube to a case.

[Means for Solving the Problems] A first holder that fits and holds the tube side of a cathode ray tube for viewfinder, the tube side of which has an inverted conical shape;
A view finder having a second holder that comes into contact with the first holder and fits and holds the inverted conical tapered surface side of the cathode ray tube, and a case that houses the first holder, the second holder, and the cathode ray tube. In this cathode ray tube holding device, rectangular and arcuate flange portions that abut each other are integrally formed on each surface side of the abutting portions of the first holder and the second holder. A pair of lock portions that engage with each other are integrally formed on the upper and lower sides of the abutment portions of the two holders, and a pair of lock portions that abut each other on both sides of the abutment portions of the first holder and the second holder are formed on the case. A pair of fitting grooves are respectively formed into which matching rectangular and arc-shaped flanges fit.

[Function] Both sides of the abutting parts of the first holder, which fits and holds the tube surface side of the cathode ray tube for viewfinder, and the second holder, which fits and holds the inverted conical tapered surface side of the cathode ray tube. The rectangular and arcuate collar portions that abut each other are engaged by each pair of lock portions with the cathode ray tube positioned. Simply fit the rectangular and arc-shaped flanges that abut each other on both sides of these contact parts into the pair of fitting grooves of the case.
The cathode ray tube is positioned and held at a predetermined position in the case.

[Example] Hereinafter, an example of this invention will be described in detail with reference to the drawings. Incidentally, the video camera 1 in FIG. 8 is used.

In FIG. 1, reference numeral 2 denotes an electronic viewfinder detachably attached to the upper surface of the main body of the video camera 1. As shown in FIG. This electronic viewfinder 2 is designed so that the image of the subject recorded on the cathode ray tube 5 is projected in black and white while the video camera 1 is recording, and the projected image is checked from the eyecup 6a. Cases 3 and 4
The cathode ray tube 5 is housed inside the pair of cases 3 and 4, and the eye cup 6a is fitted to one end surface of the pair of cases 3 and 4 on the tube surface 5a side of the cathode ray tube 5. It is roughly composed of an eyepiece versi 6, etc.

As shown in FIGS. 2 to 7, the cathode ray tube 5 is held and attached to a predetermined position in the lower case 4 by a cathode ray tube holding device described below. In detail, the cathode ray tube 5
In this case, the tube surface 5a has an inverted conical shape (this tapered surface is denoted by 5).
b), and the body portion 5c is formed in a cylindrical shape. The tube surface 5a side of this cathode tube surface 5 is fitted and held by a first holder 10, and the inverted conical tapered surface 5b side is fitted and held by a second holder 20.
I have kept it.

As shown in FIGS. 2 to 4, the first holder 10 is molded of synthetic resin into a cylindrical shape large enough to allow insertion of the tube surface 5a side of the cathode ray tube 5, and has a rectangular opening 11 on its front surface. have. Also, the first
A pair of L-shaped upper and lower hook portions 12 and 13 are integrally molded at upper and lower positions on the outer peripheral surface of the holder 10 on the side of the rear portion 10a (the portion that contacts the second holder 20) so as to protrude. Furthermore, this rear 10
On both sides of the outer periphery of a, there is a rectangular flange (on the right side in the figure).
14 and an arc-shaped flange 15 (on the left side in the figure) are integrally molded so as to protrude.

As shown in FIGS. 2 and 3 and 6 and 7, the second holder 20 has a cylindrical shape with a tapered inner surface of a front portion 20a (a portion that contacts the rear portion 10a of the first holder 10). It is integrally molded from synthetic resin, and has a circular opening 21 that is one size larger than the body 5c of the cathode ray tube 5 at the rear. Further, a pair of L-shaped upper hook portions 22 and a rod-shaped lower hook portion 23 are integrally molded at upper and lower positions on the outer peripheral surface of the front portion 20a side of the second holder 20 so as to protrude. Further, a rectangular flange 24 and an arcuate flange 25 are integrally molded at positions corresponding to the flange portions 14 and 15 of the first holder 10 on both sides of the outer peripheral edge of the front portion 20a. It has been done. Furthermore, a locking hole 26 for locking the set screw 7 is provided in the center of the rectangular flange 24 to protrude in the horizontal direction.

A first holder 10 and a second holder 20 are placed at opposing positions in the front portion of the lower case 4 that accommodates the cathode ray tube 5 and the like, into which the eyepiece versi 6 is fitted.
The left and right flanges 14, 24 and 15, 25 in contact with
Fitting grooves 4a and 4b are formed into which the two fit. Further, a third holder 8 having an elastic force and an inverted Ω shape is fixed to a predetermined position on the bottom surface of the lower case 4, and the third holder 8 has an elastic force that holds the body 5c of the cathode ray tube 5. A support (not shown) for securing the locking hole portion 26 with a screw 7 is provided in a protruding manner. Furthermore, the tapered surface 5b and the body portion 5c of the cathode ray tube 5
A rubber O-ring 30 is fitted into the boundary portion. Incidentally, reference numeral 9 in FIG. 1 is a deflection coil for deflecting the screen on the tube surface 5a of the cathode ray tube 5. Further, an eyepiece lens (not shown) for enlarging the image on the tube surface 5a of the cathode ray tube 5 is arranged in the eyepiece versi 6.

According to the cathode ray tube holding device of the viewfinder 2 of the embodiment described above, when the cathode ray tube 5 having the deflection coil 9 fitted therein is held and attached to the lower case 4 at a predetermined position via the holders 8, 10, 20, ,
As shown in FIG. 2, the O-ring 30 on the tapered surface 5b side of the cathode tube wire 5 and the second holder 20 are fitted in advance. Next, the opening 11 of the first holder 10 is positioned and fitted onto the tube surface 5a of the cathode ray tube 5. At this time, the first holder 1
Align the openings 11 of 0. From this state, the first
A pair of upper and lower lock parts 12 and 13 of the holder 10
While moving and rotating the second holder 20, the pair of upper and lower lock portions 22, 23 of the second holder 20 is moved and rotated.
engage and lock each other. and,
The left and right flanges 14, 24 and 15, 2 of the first holder 10 and the second holder 20 are in contact with each other.
5 into the pair of fitting grooves 4a, 4b of the lower case 4, respectively, and the body 5c of the cathode ray tube 5.
is held in the third holder 8 and the second
By screwing the locking hole portion 26 of the holder 20 to the column of the lower case 4, the cathode ray tube 5 can be easily positioned and attached to the lower case 4.

In this way, the tube surface 5a side of the cathode ray tube 5 is easily held by the locks 12, 22 and 13, 23 of the first holder 10 and second holder 20. , since the second holder 20 and the tapered surface 5b of the cathode ray tube 5 are in pressure contact with each other with no gap, the connection between the second holder 20 and the tapered surface 5b of the cathode ray tube 5 is similar to that between the conventional first and second holders 7A, 7B and the cathode ray tube 5. There will be no gap and no wobbling, and the cathode ray tube 5 can be prevented from rotating idly between the first holder 10 and the second holder 20 during installation work. Therefore, the position of the screen of the cathode ray tube 5 does not move from within a predetermined value of the horizontal line of the standard value, and the installation workability is further improved.

Further, the left and right flanges 14, 24 and 15 of the first holder 10 and the second holder 20 that are in contact with each other,
25 are respectively fitted into the pair of fitting grooves 4a and 4b of the lower case 4, and the second holder 20 is fixed to the lower case 4 with screws 7, so that the first holder 10 and the second holder 20 do not rotate freely. This makes it possible to reliably prevent the cathode ray tube 5 from being damaged, and further facilitate the installation work of positioning the cathode ray tube 5 at a horizontal position within the standard value.

In the above embodiment, two sets of lock parts are provided on the first and second holders, but two or more sets of lock parts may be provided.

[Effects of the invention] As described above, according to this invention, there is a first holder that fits and holds the tube side of a cathode ray tube for viewfinder whose tube side has an inverted conical shape, and a first holder that abuts the first holder. A rectangular and an arcuate flange which abut each other are integrally formed on each side of the abutting part of the second holder which fits and holds the inverted conical tapered surface side of the cathode ray tube, and abuts the cathode ray tube. A pair of lock portions that engage with each other are integrally formed on the upper and lower sides of the contact portions of the first holder and the second holder, respectively, and a case that accommodates the first holder, the second holder, and the cathode ray tube is provided with the lock portions. 1 holder and 2nd
By forming a pair of fitting grooves into which the rectangular and arc-shaped flanges that abut each other on both sides of the holder's abutting part are fitted, the first holder and the second holder are ensured to rotate freely in the case. In addition, the cathode ray tube can be easily and reliably positioned and held in the case.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a view finder showing an embodiment of this invention, Fig. 2 is an exploded perspective view of a first holder and a second holder, and Fig. 3 is an exploded perspective view of a view finder showing an embodiment of this invention. A bottom view showing the locked state of the holder, Figure 4 is a front view of the first holder,
Figure 5 is a side view of the first holder, Figure 6 is a plan view of the second holder, Figure 7 is a rear view of the second holder, Figure 8 is an overall perspective view of the video camera with a viewfinder attached, and Figure 8 is a perspective view of the video camera with a viewfinder attached. FIG. 9 is an exploded perspective view of a conventional viewfinder, and FIG. 10 is a plan view of a cathode ray tube of a conventional viewfinder, showing a state in which the tube side is held by a first holder and a second holder. 2... Viewfinder, 4... Case, 4
a, 4b...Pair of fitting grooves, 5...Cathode ray tube, 5
a...tube surface, 5b...tapered surface, 10...first holder, 10a...rear part (contact part), 12, 22
...Pair of lock parts, 13, 23...Pair of lock parts, 14...Rectangular collar part, 15...Circular collar part, 20...Second holder, 20a...Front part (contact part ), 24... Rectangular flange, 25... Arc-shaped flange.

Claims (1)

[Claims for Utility Model Registration] A first holder that fits and holds the tube side of a viewfinder cathode ray tube whose tube side is in the shape of an inverted cone; A cathode ray tube holding device for a viewfinder, which has a second holder that fits and holds the tapered surface sides of the viewfinder, and a case that houses the first holder, the second holder, and the cathode ray tube. Rectangular and arcuate flanges that abut each other are integrally formed on each side of the abutting portion of the holder, and are engaged with each other on the upper and lower sides of the abutting portions of the first holder and the second holder. Each pair of lock portions is integrally formed to protrude, while the first holder and the second lock portion are formed on the case.
1. A cathode ray tube holding device for a viewfinder, characterized in that a pair of fitting grooves are formed on each side of a contacting portion of a holder, into which rectangular and arcuate flanges that abut each other are fitted.