JPS6244466B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television camera, and in particular to a structure in which a main lens system, an image pickup tube, and an optical viewfinder are held and fixed by a single frame, which facilitates assembly work and reduces the size of the camera. - The purpose is to provide a television camera that can be made lightweight.

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.

The present invention eliminates the above-mentioned drawbacks, 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 the 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 3b for an image pickup tube, 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 1, and is attached between both ends of the frame 1. 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 roughly L-shaped cylinder, has a surface including the optical axis _l1 of the main lens system 3 and the image pickup tube 4 (in the case of this embodiment, the optical axis of the optical viewfinder section).
The left frame half 2A is shown in Figure ₂ , and the right frame half 2 is shown in Figure 2.
B are shown in FIG. In this specification, left, right,
Front and rear indicate the directions when viewed from the camera operator 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 represented by the same numbers with the suffix "B".
The explanation will be omitted. In this embodiment, the image pickup tube cover section 27 is separate from the right frame half 2B, but the right frame half 2B can also be configured integrally with the left frame half 2A, and in this case the cover The portion 27 is formed as shown by the two-dot chain line in FIG. 3A.

Further, in the right frame half 2B, 28 is a recess into which a motor for driving the lens diaphragm mechanism is inserted, and 29 is a window for adjusting the relay lens.

The left and right frame halves 2A and 2B are molded parts made of synthetic resin (for example, glass-containing Noryl), and are manufactured with sufficiently high dimensional accuracy 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 respectively 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. 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, metal foil, vinyl tape, etc. can be inserted in the state in which they are held together, as in the case of holding the zoom lens, as necessary. It is temporarily fastened without any play.

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, the image pickup tube 4, and various lenses for optical viewfinder can be connected to the notches 8B, semicircular notches 9B, 14B, 15B, and notches 17B, 24 of the right frame half 2B, respectively.
B, 25B, etc., and the opposing surfaces 2A ₁ and 2B ₁ of both frame halves 2A and 2B abut.
Furthermore, the left and right frame halves 2A, 2 that are butted together
By fixing B with screws, 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. After that, an electrical component mounting board (not shown) is also attached to the frame 2.

In addition, in the right frame half shown in FIG. 3A, if the image pickup tube cover part 27 shown by the two-dot chain line is separate from the frame half, it may be removed after the above-mentioned assembly or after completion as a television camera. The image pickup tube assembly can be easily replaced, adjusted, etc.

FIG. 4 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. The right side frame half 2C has a structure in which the bracket 5C is integrally formed with the frame half 2C', whereas the bracket 5 and frame 2 are separate bodies in the previous embodiment. Even when this frame half 2C is used, the same effect as described above can be obtained.

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, since the main lens system, the image pickup tube, and the optical viewfinder are held and fixed together by a single frame, the number of assembly and manufacturing steps can be effectively reduced. Therefore, it can be easily assembled, and can be effectively reduced in size and weight. Furthermore, it has a structure in which the optical path forming part for the optical viewfinder is integrally formed in the frame itself. Therefore, there is no need to attach the optical path forming section to a special frame, and the optical path forming section can be made to have high precision.It is particularly effective when applied to home television cameras that need to be inexpensive. It has features such as being able to play music.

[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;
2B and 3B are cross-sectional views taken along line B-B in FIGS. 2A and 3A, respectively, and FIG. 4 is a frame half view of the second embodiment of the television camera of the present invention. It is a front view of the body. DESCRIPTION OF SYMBOLS 1...Television camera, 2...L-shaped frame, 2A...Left frame half, 2B...Right frame half, 2A ₁ , 2B ₁ ...Opposing surface, 2C...
...Right frame half, 2C'...Frame half, 3...Main lens system, 3a...Zoom lens,
3b, 31... Master lens for image pickup tube, 4...
Image pickup tube assembly, 5,5C...L-shaped bracket,
6... Viewfinder eyepiece, 7A, 7B,
7C...opening, 8A, 8B, 8C...kerf, 9
A, 9B, 9C, 10A, 10B, 10C, 11
A, 11B, 12A, 12B...semicircular notch,
15A, 15B, 15C...flange-like protrusion, 16
A, 16B, 16C...Semicircular notch, 17A,
17B... Cut groove, 18A, 18B, 18C... Semicircular notch, 20A, 20B, 20C... Semi-cylindrical notch, 25A, 25B, 25C... Cut groove for positioning eyepiece lens for viewfinder, 33... ...Optical low-pass filter, 35... Master lens assembly for viewfinder, 37... Field lens assembly, 38... Relay lens assembly.

Claims (1)

[Claims] 1. A main lens system, an image pickup tube, and an optical view indexer are integrally held by a single frame,
Furthermore, the television camera is characterized in that the frame itself has a structure in which an optical path forming section for an optical viewfinder is integrally formed. 2. The frame is formed with a first holding part that fits and holds the main lens system at the front, a second holding part that fits and holds the image pickup tube at the rear, and further includes a first holding part that fits and holds the image pickup tube. A first aperture path that communicates with the second holding portion to form a first optical path, and a second aperture path that forms a viewfinder optical path that guides light from the first optical path. A television camera as claimed in claim 1.