JPH057809Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a fixing device for an image sensor in a video camera.

(Background of the invention) Figure 5 shows a general video camera. In the figure, 1 is a photographing lens, and 2 is an optical axis a of the photographic lens 1.
It is a half prism placed on top. The half prism 2 splits the light from the subject into transmitted light b and reflected light c, the transmitted light b is guided to the viewfinder 6 through the pentaprism 3, mirror 4 and eyepiece 5, and the reflected light c is sent to the master lens 7 and the filter. 8 and an image sensor (image sensor tube or solid-state image sensor) 9 for converting the light into an electrical signal. The image sensor 9 is fixed in an accurately positioned state so that the center of its image circle coincides with the optical axis c of the master lens 7. Therefore, the fixed position of the image sensor 9 can only be determined using one pattern.

However, since the image sensor 9 comes to have a plurality of different types of image circles by changing its internal electrical drive method, when changing the image circle to a different image circle after fixing the image sensor 9, Correspondingly, it is necessary to change the position of the image sensor so that it coincides with the optical axis of the optical system.

However, in the conventional case, the mounting position of the element fixing frame (not shown) had to be changed, or the mounting position or mechanism on the optical system side had to be changed, which was not only troublesome but also made it difficult to maintain accurate position accuracy. It was difficult to get it out.

[Purpose of invention]

This invention is intended to solve the above-mentioned problems, and provides an image sensor fixing device that allows the centers of image circles of different types of image sensors to easily and accurately match the optical axis of an optical system. The purpose is to

[Structure of the idea]

In order to achieve the above object, this invention has an optical path hole in the center of the plate-like body, and around the optical path hole,
A first matching hole that matches the mounting hole provided at an opposing position on the outer periphery of the image pickup element fixing frame, and a second matching hole that matches the mounting hole provided at the opposing position on the end flange portion of the optical system barrel; A plurality of pairs of at least one of the first and second matching holes are provided so that straight lines connecting the hole centers intersect, and an intermediate member is provided so that the midpoint of the straight line is shifted by a certain amount. An appropriate number of set screws are provided to attach the image pickup element fixing frame and the optical system barrel via an intermediate member, and the intermediate member is reversed or rotated by a certain angle to connect the image pickup element fixing frame and the optical system barrel. The structure is such that the centers of image circles of different types of image pickup devices can be easily aligned with the optical axis of the optical system by simply fixing them again.

〔Example〕

Next, this invention will be explained based on the embodiments shown in FIGS. 1 to 4.

FIG. 1 is a side view schematically showing the configuration of the device of the present application. In the figure, 20 is the lens barrel of the optical system 21;
Reference numeral 22 denotes an image pickup element, 23 an element fixing frame for fixing the image pickup element 22, and 24 an intermediate member for fixing the lens barrel 20 of the optical system 21 and the element fixing frame 23. In addition, when the image sensor 22 is used with different image circles A and B by changing its driving method,
Since the optical black is the starting point, the center O of the image circle A and the center 0' of the image circle B are eccentric from each other by "t".

The intermediate member 24 is formed of a square plate-shaped body having an optical path hole 25 for the lens barrel 20 in the center,
At the diagonal positions, two pairs of first matching holes 27a and 27a', 27b and 27 that match the mounting holes 26 and 26' provided at opposite positions on the outer periphery of the element fixing frame 23 are provided.
b' is provided, and a pair of second matching holes 29, 29 are provided on the opposite side to match the two pairs of mounting holes 28a and 28a', 28b and 28b' provided at opposing positions on the end flange portion of the lens barrel 20. ' is provided.

The first matching holes 27a and 27a' and 27b and 2
7b' is a line R connecting the hole centers as shown in Fig. 3;
The midpoints m and m' of R' are shifted by an amount of eccentricity "t" between the centers O and O' of the plurality of different image circles A and B of the image pickup device 22.

Therefore, in the above embodiment, for example, one of the first mating holes 27 is inserted into the mounting holes 26 and 26' provided at opposing positions on the outer periphery of the element fixing frame 23 for the intermediate member 24.
A and 27a' are aligned and fixed with a set screw 31, and the second matching holes 29, 29' are inserted into the lens barrel 20.
Attachment hole 28 provided at the opposite position of the end face flange part of
a, 28a' and fixed with a set screw 32, the center O of one image circle A of the image sensor 22 will coincide with the optical axis c of the optical system 21, as shown in FIG. 4I. . Further, the intermediate member 2
4 is turned upside down (the left and right positions of 27a and 27b are reversed in FIG. 2) or rotated 90 degrees (27a is moved to the position of 27b in FIG. 2), and the outer peripheral part of the element fixing frame 23 is removed. The other first matching holes 27b and 27b' are aligned with the mounting holes 26 and 26' provided at opposite positions and fixed with the setscrew 31, and the second matching holes 29 and 29' are connected to the lens barrel 20. When the center O' of the other image circle B of the image sensor 22 is aligned with the mounting holes 28a, 28a' or 28b, 28b' provided at opposing positions on the end flange portion and fixed with the setscrew 32, the center O' of the other image circle B of the image sensor 22 is as shown in FIG. It comes to coincide with the optical axis c of the optical system 21 as shown in FIG.
In other words, the image sensor 22 is fixed with respect to the lens barrel 20 with the centers O and O' of the different image circles A and B shifted by an amount of eccentricity "t".
In the above case, one of the first matching holes 27a, 27
It is preferable to provide marks for distinguishing a' from the other first matching holes 27b, 27b, for example, cutouts 24a, 24b at the corners of the intermediate member 24.

In the above embodiment, two pairs of first matching holes 27a are provided at diagonal positions of the intermediate portion 24 to match the mounting holes 26, 26' provided at opposing positions on the outer circumference of the element fixing frame 23.
27a', 27b and 27b', the midpoints of the lines R and R' were shifted by a certain amount, but the lens barrel 2
A plurality of pairs of second matching holes 29, 29' are provided to match the two pairs of mounting holes 28a, 28a', 28b, 28b' provided at opposing positions on the end flange portion of the 0, and the center of the line connecting the centers of the holes is provided. Of course, the same results as above can be obtained even if the values are shifted.

Further, in the above embodiment, the intermediate member 24 is shown as a square plate-shaped body, but it may be circular or other shapes, and there are not only two types of position correction, but also several types of position correction in the x and y directions. It is also possible to make it configurable.

[Effect of idea]

As described above, this invention has an optical path hole in the center of the plate-like body, and a first matching hole in the periphery of the optical path hole that matches the mounting hole provided on the outer periphery of the image sensor fixing frame. , a second matching hole that matches the mounting hole provided at the opposite position of the end flange portion of the optical system barrel;
A plurality of pairs of at least one of the first and second matching holes are provided so that straight lines connecting the hole centers intersect, and an intermediate member is provided such that the midpoint of the straight line is shifted by a certain amount, Since an appropriate number of setscrews are provided for attaching the image sensor fixing frame and the optical system barrel via the intermediate member, the image circle can be changed to a different image circle by changing the electrical drive method inside the image sensor. Even when used as an optical system, the center of the image circle can be easily and precisely aligned with the optical axis of the optical system by simply changing the mounting position of the intermediate member. Therefore, this provides an excellent effect in that there is no need to change the mounting position of the element fixing frame, or to change the mounting position or mechanism on the optical system side, as in the prior art.

[Brief explanation of the drawing]

Fig. 1 is an abbreviated exploded side view of this device, Fig. 2 is a perspective view of the body, Fig. 3 is a front view of the intermediate member, Fig. 4 is a sectional view of the fixed state, and Fig. 5 is a schematic diagram of the video camera. FIG. 20... Lens barrel, 21... Optical system, 22... Image pickup element, 23... Element fixing frame, 24... Intermediate member,
25...Optical path hole, 26, 26'...Mounting hole, 27
a, 27a', 27b, 27b'...first matching hole, 2
8a, 28a', 28b, 28b'...Mounting hole, 2
9, 29'...Second matching hole.

Claims (1)

[Scope of utility model registration request] An optical path hole is provided in the center of the plate-shaped body, and a first matching hole that matches a mounting hole provided at a position facing the outer periphery of the image pickup element fixing frame is provided at the periphery of the optical path hole, and an end surface of the optical system barrel. A second matching hole is provided that matches the mounting hole provided at the opposing position of the flange portion, and a plurality of pairs of at least one of the first and second matching holes are provided so that a straight line connecting the hole centers intersects, Further, an intermediate member configured such that the midpoint of the straight line is shifted by a certain amount is provided, and an appropriate number of setscrews are provided for attaching the image pickup element fixing frame and the optical system barrel via the intermediate portion. A fixing device for an image sensor, characterized in that: