JPH0528858Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is used for example in video cameras.
The present invention relates to a camera CCD imaging device mounting device that improves the mounting accuracy of the CCD imaging device.

(Prior Art) In recent years, CCD imaging devices have been adopted as imaging elements for television cameras, video cameras, and the like.
This type of camera uses an imaging lens to form an optical image of the subject on a CCD imaging device as a two-dimensional image, and photoelectric conversion is performed on the CCD imaging device to form a charge image corresponding to the optical image. By scanning this charge image from the end, it is extracted as a one-dimensional electrical signal. For this reason, the CCD imaging device must be mounted so that its center is located on the optical axis and forms a plane perpendicular to the optical axis.

By the way, CCD imaging devices are, for example, plate-shaped.
It is enclosed in a CCD package, and both ends are supported by split support blocks and screwed to the support plate.A filter case having an optical low-pass filter is attached to this split support block, and this filter case is attached to the mirror of the imaging lens. The optical low-pass filter is fitted into the tube and is screwed in such a way that it faces the photographic lens.

(Problem to be solved by the invention) However, since the CCD package is supported at both opposing ends, it is positioned in the supporting direction, but positioning in the direction not supported by the split support block is insufficient, and CCD imaging The central part of the device may be off the optical axis or the perpendicularity to the optical axis may be lost.

This idea was made in consideration of the actual situation,
It is an object of the present invention to provide a CCD imaging device mounting device for a camera that has a simple structure and improves the mounting accuracy of a CCD imaging device.

(Means for Solving the Problems) In order to solve the above-mentioned problems, this invention provides a camera that forms an optical image of a subject as a two-dimensional image on a CCD imaging device using an imaging lens. A CCD case having a storage recess with a cutout in the side wall near one of the four corners in which a rectangular CCD package enclosing a CCD imaging device is stored is attached to the lens barrel.
The CCD package cage stored in the storage recess is urged by an elastic member having two legs provided at the corner of the storage recess toward the corner opposite to the corner where the side wall is cut out, and the CCD package cage is pushed into the storage recess. A CCD imaging device mounting device for a camera that positions the CCD imaging device in a direction perpendicular to the optical axis of the imaging lens by holding the CCD imaging device in pressure contact with an inner wall of the camera.

(Function) In this device, the CCD package cage is biased toward the opposite corner by an elastic member provided at the corner of the storage recess, and is pressed against the inner wall of the storage recess to regulate its position in the horizontal and vertical directions. , this allows the center part of the CCD imaging device to be held on the optical axis,
The mounting accuracy of the CCD imaging device is improved.

(Example) Hereinafter, an example of this invention will be described in detail based on the accompanying drawings.

In the figure, reference numeral 1 denotes a lens barrel of a video camera, and this lens barrel 1 is equipped with an imaging lens 2. The imaging lens 2 captures an optical image of a subject onto a CCD imaging device 4 via an optical low-pass filter 3 into a two-dimensional image. Form an image. Optical low pass filter 3
It is housed in a filter case 6 that is attached to the CCD case 5 with screws (not shown), and is connected to the imaging lens 2.
It is arranged in the recess 7 of the lens barrel 1 with a predetermined gap between it and the CCD imaging device 4.

This CCD imaging device 4 is a CCD as a chip.
It is provided in the package 8, and its center portion is on the optical axis H, and performs photoelectric conversion at the focal point of the imaging lens 2 to form a charge image corresponding to the optical image. By scanning from the end, it is extracted as a one-dimensional electrical signal.

The CCD package 8 is formed into a rectangular plate shape.
It is stored in a storage recess 9 formed in the CCD case 5 that is slightly larger than the CCD package cage.

The left and right opposing side walls 5a of the CCD case 5 have screw holes 1 for attaching the filter case 6 at symmetrical positions.
0 and a boss portion 11 are formed, and the CCD package 8 is attached by bringing the boss portion 11 into contact with the lens barrel 1 and screwing it with a screw 13 inserted through an insertion hole 12 of the boss portion 11. The pair of screw holes 11 are formed in symmetrical positions as shown in FIG. This makes it easy to screw onto the CCD case 5.

One side of the CCD package cage 8 has a rubber package 1.
4 is pressed by the filter case 6, and the other side surface is pressed against support protrusions 15 formed at three locations on the bottom 9a of the storage recess 9. The surface formed by the support protrusion 15 of the CCD case 5 and the surface formed by the boss portion 11 of the side surface 5a are parallel, ensuring mounting accuracy in the Z direction and
The perpendicularity of the CCD imaging device 4 can be obtained, and wobbling of the CCD package 8 in the optical axis H direction can be suppressed.

As shown in FIG. 2, the storage recess 9 has a cutout in the side wall near the lower right corner, and an elastic member 16 is fixed to the cutout 5b with screws 17. This elastic member 16 has two legs 16a, and the legs 16a sandwich the corner of the CCD package 8 and urge it toward the opposite side, that is, the upper left corner, and the CCD package 8 is biased toward the opposite side, that is, toward the upper left corner. The left side wall is pressed against the support protrusion 18 on the inner wall of the storage recess 9, and the upper side wall is pressed against the support protrusion 19 on the inner upper wall of the storage recess 9. The support protrusion 18 of this storage recess 9 and
In the horizontal direction, that is, in the X
The mounting accuracy in the vertical direction, that is, the Y direction is ensured by the support protrusion 19 and the boss portion 11, and the center of the CCD imaging device 4 is located on the optical axis H. Moreover, the biasing force of the elastic member 16 prevents the CCD package cage 8 from wobbling in the horizontal and vertical directions.

In addition, since the mounting accuracy of the CCD imaging device 4 is ensured in this way, there is no need to fit the filter case into the lens barrel and install it as in the past.
Moreover, when the filter case 6 is formed of resin, for example, the resin is not limited to one with stable dimensional accuracy, and the degree of freedom in selecting the resin for forming the filter case 6 is expanded, and production costs can be reduced. I can do it.

(Effects of the invention) As mentioned above, this invention stores the CCD package cage in the rectangular storage recess formed in the CCD case, attaches the CCD case to the imaging lens barrel,
In addition, since the CCD package cage is urged toward the opposite corner by an elastic member provided at the corner of the storage recess and is held in pressure contact with the inner wall of the storage recess, the position can be controlled in the horizontal and vertical directions. The central part of the CCD imaging device can be held on the optical axis. Therefore, by pressing the CCD package with an elastic body, the mounting accuracy of the CCD imaging device can be ensured with a simple configuration, and furthermore, in this way,
As the mounting accuracy of the CCD imaging device is ensured,
There is no need to fit and attach the filter case to the lens barrel as in the past.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the CCD imaging device mounting device of a camera to which this idea is applied, and Figure 2 is a view from the lens barrel.
FIG. 6 is a diagram showing a state in which the CCD case is removed and the CCD package is supported. In the figure, 1 is a lens barrel, 2 is an imaging lens, 3 is an optical low-pass filter, 4 is a CCD imaging device, 5
is CCD case, 6 is filter case, 8 is CCD
9 is a storage recess, 14 is a rubber gasket, 15, 18, 19 are positioning projections, and 16 is an elastic member.

Claims (1)

[Scope of utility model registration request] In a camera that forms an optical image of a subject as a two-dimensional image on a CCD imaging device with an imaging lens, a CCD package enclosing the CCD imaging device is housed in a lens barrel of the imaging lens.
A CCD case having a storage recess with a cutout in the side wall near one of the four corners is attached and attached, and the CCD case stored in the storage recess is attached to the two CCD cases provided in the corner of the storage recess. An elastic member having a leg portion is biased toward the corner opposite to the corner where the side wall is cut out, and is held in pressure contact with the inner wall of the storage recess, thereby allowing the image pickup lens to be moved perpendicularly to the optical axis of the imaging lens. a camera CCD imaging device mounting device for positioning said CCD imaging device in a direction;