JPS6262104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television camera, and in particular, a main lens system, an image pickup tube, and an optical viewfinder are held and fixed in a single frame, and the image pickup tube is detachable independently after assembly. By making the structure easier to assemble, smaller size, lighter weight,
Another object of the present invention is to provide a television camera that can effectively facilitate maintenance.

Although a conventional television camera is a simple type for home use, the main lens system and image pickup tube are held separately by a holding base, this holding base is attached to a basic chassis, and this basic chassis is further fixed to a cabinet. This basic chassis was manufactured through an assembly process in which an optical viewfinder was attached to a fixed cabinet. For this reason, there are disadvantages in that the number of assembly steps increases, the number of adjustment points increases, and it is extremely difficult to reduce the size and weight of the device.

Furthermore, in television cameras, adjustment and maintenance of the image pickup tube is required more frequently than the main lens system and optical viewfinder. Therefore, in view of serviceability, it is desirable to configure the image pickup tube to be detachable independently while the main lens system and optical view index remain fixed to the frame.

The present invention eliminates the above-mentioned drawbacks and satisfies the above-mentioned requirements, and embodiments thereof will be described below with reference to the drawings.

1 is a side view schematically showing the internal structure of the first embodiment of the television camera according to the present invention; FIG.
Figures A and 3A are views showing left and right frame halves that are combined to form the frame of Figure 1, respectively. 2B and 3B are cross-sectional views taken along line BB in FIGS. 2A and 3A, respectively.

In FIG. 1, a television camera 1 is composed of an L-shaped frame 2 and a main lens system 3 (a zoom lens 3a, a master lens for an image pickup tube 3b, etc.), but in order to simplify the description, , the description of the main lens system 3 is simply the zoom lens 3.
(represented by a) and the image pickup tube assembly 4
and an electrical component mounting board (not shown). 5 is an L-shaped bracket;
It is provided as a separate part from the frame 2, and is attached between both ends of the frame 2. The frame 1 and the bracket 5 form a generally rectangular frame structure. Reference numeral 6 designates an eyepiece portion of the optical viewfinder section.

The frame 2, which is a generally L-shaped cylinder, has a surface including the optical axis _l1 of the main lens system 3 and the image pickup tube assembly 4 (in the case of this embodiment, it also includes the optical axis _l2 of the optical viewfinder section). It is divided into two parts by
The left frame half 2A is shown in FIG. 2, and the right frame half 2B is shown in FIG. 3. In this specification, left,
Right, front, and back indicate the directions when viewed from the camera operator's side. Further, in FIGS. 2A and 3A, the optical system is indicated by a dashed line.

In FIG. 2, the front side of the left frame half 2A (on the right side in the figure) includes an opening 7A for inserting the rear part of the main lens system 3, and a cutout into which the flange (ring protrusion) of the main lens system 3 fits. A groove 8A (constituting a first holding portion that fits and holds the main lens system 3) and a first optical path for forming an image of light from the zoom lens 3a on the photoelectric conversion surface of the image pickup tube 4 are formed. Semicircular notches 9A, 10
A, 11A, 12A, and a rectangular notch 13A are formed. Rear (left side) of semicircular notch 12A
has a semicircular cutout 14A into which an annular elastic body for pressing the front end surface of the imaging tube 4 in the left direction is inserted;
Furthermore, behind this, there is a semicircular notch 16 with a flanged protrusion 15A projecting from the center for regulating the position of the image pickup tube 4.
A (which constitutes a second holding part that fits and holds the imaging tube 4) is formed.

Moreover, a semicircular notch 18A having a kerf 17A, a mirror recess 19A, and a semicylindrical notch 20A (optical viewfinder optical path forming part) are formed in the upper part of the opening 7A. These form the optical path for the optical viewfinder. In this semi-cylindrical notch 20A, flange-like protrusions 21A, 22A, 23A for positioning various lenses, a cut groove 24A for mirror positioning, and a cut groove 25A for positioning eyepiece lens for viewfinder are formed at predetermined positions. There is.

26A is a screw hole for screwing and fixing the left and right frame halves, and 30 is a projection for holding the bracket 5.

3A and 3B each show the right frame half 2B. In the figure, components that perform the same functions as the components of the left frame half 2A shown in FIGS. 2A and B are designated by the same numbers with the suffix "B".
The explanation will be omitted. This right side frame half 2B
, a portion corresponding to the second holding portion for holding the image pickup tube in the left frame half 2A is not formed. This second holding portion serves as the cover member 27 shown in FIGS. 4A to 4C, and the left and right frame halves 2A,
It is formed as a separate part from 2B.

In addition, in the above-mentioned right side frame half 2B,
28 is a recess into which a motor for driving the lens aperture mechanism is inserted, and 29 is a relay lens adjustment window.

The cover member 27 shown in FIGS. 4A to 4C has a shape that is roughly symmetrical to the second holding part of the left frame half 2A, and has the same function as the component shown in FIGS. 2A and B in each figure. The parts are denoted by the same reference numerals with the suffix "B", and the explanation thereof will be omitted. Rectangular cutout 1
No recess is formed in 3B, and this notch 1
When the cover member 27 is attached, the optical low-pass filter 3B is inserted into the notch of the rectangular notch 13A to restrict its position by holding down the protruding part of the optical low-pass filter and restricting its movement and removal. Fulfill.

The left and right frame halves 2A and 2B and the cover member 27 are molded parts made of synthetic resin such as Noryl containing glass, and are manufactured with sufficiently high dimensional precision of each part.

Next, the process of attaching the main lens system 3 and the image pickup tube 4 to the frame and assembling the television camera will be described.

First, the zoom lens 3a is attached to the front side of the left frame half 2A. For this installation, cut the rear end flange of the zoom lens 3a into the groove 8A (first holding part).
This is done by fitting the notch around the flange into the protrusion in the notch 8A, and the position of the zoom lens 3a in the optical axis direction and the circumferential direction is precisely regulated. Note that since the left frame half 2A is formed with high dimensional accuracy, the zoom lens 3a is assembled with almost no need for fine adjustment. In addition, if the clearance of the fitting part is relatively large due to manufacturing requirements, insert metal foil, vinyl tape, etc. into the groove 8A and place them between the flange and the frame half. It can be installed by clamping it without any play. Furthermore, a fine adjustment mechanism using a set screw or the like may be provided in connection with the first holding portion.

Furthermore, the master lens 31 for the image pickup tube is inserted into the semicircular notches 9A, 10A, and 11A. An annular plate 32 is fixed to this master lens 31. The master lens 31 is an annular plate 3
2 is inserted between the rear end wall surface 9A ₁ of the notch 9A and the protrusion 9A ₂ , thereby being held and positioned.

The optical low-pass filter 33 has a rectangular cutout 13
Insert into the kerf A.

Next, when attaching the imaging tube, the elastic annular body 34 is inserted into the notch 14A. Next, the image pickup tube assembly 4 is moved to the second position against the elastic force of the elastic annular body 34.
It fits into the notch 16A which is the holding part. At this time, the flange-like protrusion 15A fits into the annular groove 4a of the front flange of the image pickup tube assembly 4, and the image pickup tube assembly 4 is moved toward the left in FIG. 2A due to the elastic force of the elastic annular body 34. energized by the power of Therefore, the image pickup tube assembly 4
The mounting position is regulated by the flange-like protrusion 15A of the frame half 2A.

Furthermore, the viewfinder master lens assembly 35 is installed in the notch 18A by fitting its flange into the notch 17A. The mirror 36 is fitted into the kerf 24A. Further, the field lens assembly 37 and the relay lens assembly 38 are fitted between the flange-like protrusions 21A and 22A, and between the step of the semi-cylindrical notch 20A and the flange-like protrusion 23A, and The flange of the eyepiece assembly 6 is cut into a groove 25.
Insert into A. As a result, the various lenses of the optical viewfinder are positioned and temporarily fixed to the left frame half 2A. When this optical viewfinder is used to fit and hold various lenses, if necessary, at the same time as when holding the zoom lens, metal foil, vinyl tape, etc. can be inserted in the state in which the various lenses are held together, so that the various lenses mentioned above have no play. It is temporarily fixed without any problem.

Next, the right frame half 2B to which the motor (not shown) has been inserted and fixed is appropriately positioned on the left frame half 2A to which the main lens system 3, image pickup tube 4, and various lenses for the optical viewfinder are temporarily fixed. Determine and cover. As a result, the main lens system 3 and various lenses for the optical viewfinder are connected to the notch 8B, the semicircular notch 9B, and the semicircular notch 9B of the right frame half 2B, respectively.
14B, kerfs 17B, 24B, 25B, etc., and the opposing surfaces 2 of both frame halves 2A, 2B.
A ₁ and 2B ₁ come into contact. Furthermore, the cover member 27
is placed on the second holding portion of the left frame half 2A at an appropriate position. As a result, the optical low-pass filter 33, elastic annular body 34, and image pickup tube assembly 4, which are temporarily fixed to the left frame half 2A, fit into the rectangular notch 13B and semicircular notches 14B and 16B of the cover member 27, respectively. The facing surface 27a of the cover member 27 is fitted relatively to the left frame half 2A.
It comes into contact with the opposing surface _2A1 .

Next, the left and right frame halves 2 are butted together.
A, 2B are fixed with screws, and the cover member 27
Fix it to the left side frame 2A with screws. As a result, the main lens system 3, the image pickup tube assembly 4, and the optical viewfinder are completely fixed and held by the single frame 2. Further, after that, an electrical component mounting board (not shown) is attached to the frame 2.

Here, since the imaging tube cover member 27 is a separate part from the left and right frame halves 2A and 2B, it can be independently removed from the left frame half 2A by removing the screws. Therefore, when adjusting the image pickup tube assembly 4, remove only the screws for the cover member 27 and remove this member 27, and remove the main lens system and various lenses of the optical viewfinder from the pair of frame halves 2A and 2B. While holding it in place,
Only the image tube assembly 4 is removed alone. As a result, adjustment and replacement of the image pickup tube assembly after assembly or completion of the television camera can be easily performed without affecting the main lens system, etc., and maintenance and serviceability are improved.

In the above embodiment, the cover member 27 is a completely separate part from the right frame half 2B and the left frame half 2A, but the present invention is not limited to this. Alternatively, the left frame half 2A and the cover member 27 or the right frame member 2B and the cover member 27 may be configured as integrally molded parts. A cover member 27 that is rotatable on this frame member 2A or 2B
In this case as well, the image pickup tube assembly 4 can be easily attached to and detached from the frame as described above.

FIG. 5 shows the right frame half of a second embodiment of the television camera according to the present invention. In this right frame half 2C, the same constituent parts as those of the right frame half 2B are given the same reference numerals with the addition of the suffix "C", and their explanations will be omitted. In this right side frame half 2C, the bracket 5C and the frame half 2C' are integrally molded, whereas the bracket 5 and the frame 2 are separate bodies in the above embodiment. The left frame half (not shown) to be combined with the right frame half 2B has a shape that is approximately symmetrical to the frame half 2B, and the portion surrounded by the two-dot chain line L in FIG. 5 is a cover member. 27c, it is constructed separately from the left frame half.

In each of the above embodiments, the left and right frame halves are constructed as separate parts, but the present invention is not limited to this, and the left and right frame halves may be integrally molded parts connected by a thin hinge part. It is also possible to have the same effect as above in this case as well.

As described above, according to the television camera of the present invention, the main lens system and the optical view index are combined by a pair of frame halves facing each other in abutment on a plane including the optical axis of the main lens system, etc. Since the structure is assembled and held in one piece by a single frame, it is possible to reduce assembly and manufacturing man-hours, and the main lens system etc. can be easily attached to one half of the frame during assembly and adjustment. It can be temporarily fixed, so assembly and adjustment work can be performed stably.

Regarding the image pickup tube, its end is separated from the frame by an image pickup tube holding part that is integrally formed with one half of the frame, and a separate part from the frame that works together with the image pickup tube holding part to hold the image pickup tube from one direction. The image pickup tube is held in the frame by an image pickup tube holding mechanism consisting of an image pickup tube holding member that is not covered by the frame, and only the ends of the image pickup tube are held, and the other parts are not covered by the frame and are exposed. Therefore, the television camera itself can be made smaller and lighter.

Further, since the image pickup tube holding member is separate from the frame, the image pickup tube can be freely attached and detached by simply removing the image pickup tube holding member without touching the frame. That is,
During and after assembly manufacturing, only the image pickup tube can be removed and adjusted or replaced without releasing the assembled state of the main lens system and optical viewfinder, which is convenient for manufacturing and can be done even after the product is completed. It has features such as being able to effectively improve maintenance and serviceability.

[Brief explanation of the drawing]

1 is a side view schematically showing the internal structure of the first embodiment of the television camera according to the present invention; FIG.
Figures A and 3A are front views of the left and right frame halves that are combined to form the frame in Figure 1, respectively;
Figures 2B and 3B are cross-sectional views taken along line B-B in Figures 2A and 3A, respectively; Figures 4A, B,
C is a front view, a rear view, and a side view of an imaging tube cover member, respectively, and FIG. 5 is a front view of a frame half in a second embodiment of the television camera of the present invention. 1...Television camera, 2...L-shaped frame, 2A...Left frame half, 2B...Right frame half, 2C...Right frame half, 2
C'...Frame half, 3...Main lens system, 3
a...Zoom lens, 3b, 31... Master lens for image pickup tube, 4... Image pickup tube assembly, 5, 5C...
...L-shaped bracket, 6...eyepiece of viewfinder, 7A, 7B, 7C...opening, 8A, 8
B, 8C...kerf, 9A, 9B, 9C/10A,
10B, 10C, 11A, 11B, 12A, 12
B...Semicircular notch, 15A, 15B, 15C...
... Flange-shaped protrusion, 16A, 16B, 16C... Semicircular notch, 17A, 17B... Cut groove, 18A, 1
8B, 18C...Semicircular notch, 20A, 20
B, 20C...Semi-cylindrical notch, 25A, 25B,
25C...Eyepiece positioning groove for viewfinder, 27, 27C...Image tube cover member,
27a...Opposing surface, 33...Optical low-pass filter, 35...Master lens assembly for viewfinder, 37...Field lens assembly, 3
8...Relay lens assembly.

Claims (1)

[Claims] 1. A main lens system and an optical view index,
Two pairs of frame halves are assembled and held together by a single frame with a structure in which they face each other in contact with each other on a plane including the optical axis of the main lens system, etc., and the end of the image pickup tube is attached to one frame half. an image pickup tube holder that is integrally formed with the body; and an image pickup tube holder that is separate from the frame and is not covered by the frame, which cooperates with the image pickup tube holder to hold the image pickup tube from one direction. The image pickup tube is held in the frame by an image pickup tube holding mechanism consisting of a member, and the image pickup tube alone can be attached and detached while the main lens system and the optical viewfinder are assembled and held in the frame. TV camera.