JP2679525B2 - Image sensor mounting mechanism and mounting method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting mechanism for an image pickup device and a mounting method thereof, and more particularly to a video camera (VT).
The present invention relates to improvements in a mounting mechanism and a mounting method of an image pickup element in both the R section integrated type and the separate type).

[0002]

2. Description of the Related Art In an image pickup optical system of a video camera, adjustment of an optical axis and an image tilt of an image pickup element and an image pickup lens is an essential work for maintaining optical performance. A conventional mounting mechanism and mounting method of an image pickup device having such an adjusting function will be described with reference to FIG. 4 and the like. FIG. 4 is an exploded perspective view showing a conventional mounting mechanism of an image pickup device.

In the figure, reference numeral 1 denotes an image pickup lens housing, in which a zoom lens composed of a plurality of lenses is mounted. An optical filter 3 that forms an image pickup optical system together with a lens and an image pickup device 4 such as a CCD are attached and fixed to the image pickup lens housing 1, but conventionally, as components for attaching these, a component shown in the figure is used. Optical filter holder 5, image sensor holder (image holder)
6, and a spacer rubber 7 or the like for elastically fixing the optical filter 3 was used.

Then, an optical filter holder (hereinafter also simply referred to as "filter holder") 5 having the optical filter 3 inserted therein is imaged by screws 9c and 9d with a spacer rubber 7 and an image pickup element 4 interposed therebetween. The image pickup device holder 6 was screwed onto the element holder 6, and then the image pickup device holder 6 was adjusted to the mount portion 2 and attached by the screws 9a and 9b. FIG. 5 is a cross-sectional view of an essential part showing a completed state, and 8a and 8b in the figure are adjustment margins for adjusting the optical axis and the image tilt. The image pickup device holder 6 is made of aluminum die cast in order to keep the image pickup device 4 perpendicular to the optical axis of the lens, and is ground.

Here, a method of adjustment will be described. As described above, the image pickup device holder 6 is temporarily fixed to the mount portion 2 of the image pickup lens housing 1 with the screws 9a and 9b, the camera circuit system (video signal processing circuit; not shown) is assembled, and then the adjustment is performed. A chart (not shown) is installed vertically to the image pickup optical system, and this chart is displayed on a monitor (not shown) such as a CRT through the camera circuit system, and the relative position of the image pickup element holder 6 with respect to the image pickup lens. Is moved in the direction perpendicular to the optical axis or is rotated about the optical axis as the rotation axis to perform the optical axis adjustment and the image tilt adjustment, respectively.

[0006]

The above-mentioned conventional mounting mechanism and mounting method for the image pickup device have the following drawbacks. (1) After assembling the image sensor holder, etc., adjustment of the optical axis and image tilt is essential. (2) An accurate adjustment chart is essential. (3) In order to obtain an accurate adjustment result, it is necessary to accurately align the adjustment chart and the image pickup optical system.

(4) In the conventional configuration, the assembly direction is not one direction {the filter holder 5 is mounted in the direction of the arrow α and the image pickup device holder 6 is mounted in the direction of the arrow β}, which is not suitable for the automation of the assembly. . (5) Since the relative positioning between the image sensor 4 and the optical filter 3 is not performed, the effect of the optical filter 3 tends to vary. (6) Since the image pickup device holder 6 is made of aluminum die-cast, it is heavy and the cost increases due to cutting.

(7) Since the shape of the image sensor holder 6 is point-symmetrical as shown in the plan view of FIG. 4, it is difficult to notice even if the temporary product number 4a is written on the image sensor 4, etc., and the image sensor 4 is imaged. An operator may attach the lens in the opposite direction (upside down) from the normal direction. (8) With the above configuration, the optical axis and the image tilt adjustment are unnecessary by providing a reference for the package of the image sensor 4, and the adjustment accuracy is poor because the dimensional accuracy of the package is poor, and The package is large and inconvenient. (9) When trouble occurs in the image sensor 4, the image pickup lens, etc., the operator must disassemble and repair parts such as parts replacement. It is necessary to use the equipment and devices for the work, and the work is troublesome and difficult.

[0009]

SUMMARY OF THE INVENTION An image pickup device mounting mechanism according to the present invention comprises an image pickup surface having a predetermined thickness between a mount portion of an image pickup lens housing and an image pickup device mounting member for mounting an image pickup device. An optical filter holder that also serves as position adjustment is interposed, the optical filter and a spacer rubber that elastically fixes the optical filter are interposed between the image sensor and the mount section, and an image sensor mounting member and an optical filter are provided. The mounting member to which the image pickup device is mounted and the optical filter holder are provided through the holes respectively formed at the portions of the holder facing the respective screw holes formed in the mount portion,
Each screw hole is configured to be screwed with its own screw.

The mounting method is as follows:
Two screw holes are formed, and an optical filter holder for adjusting the image plane position, which is formed to a predetermined thickness, is interposed between the mount and the image sensor mounting member to which the image sensor is mounted. An optical filter and a spacer rubber that elastically fixes the optical filter are interposed between the holder and the mount portion, and the image pickup device mounting member and the optical filter holder are respectively provided at positions facing the screw holes. The mounting member to which the image pickup device is attached and the optical filter holder are screwed into the respective screw holes with two screws through the bored holes. Another video camera is used to adjust the tilt.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mounting mechanism and a mounting method for an image pickup device according to the present invention will be described with reference to FIG. FIG. 1 is an exploded perspective view for explaining a mounting mechanism and a mounting method of an image pickup device of the present invention, FIG. 2 is a sectional view of an essential part showing a completed state thereof, and FIG. 3 is a camera 10 for image processing of an image pickup device subassembly. 6 is an exploded perspective view shown together with FIG. 4, in which the same components as those of the conventional example shown in FIGS. 4 and 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

As is clear from a comparison between FIG. 1 and FIG. 4, in the present invention, the shape of the filter holder 5, the image pickup element holder 6, and the mount portion 2 of the lens housing 1 has the greatest feature. . That is, the shape of the image pickup device holder 6 which is the image pickup device mounting member is a very simplified flat plate shape. In particular, since the image pickup device holder 6 is formed of an engineer plastic and a sheet metal of aluminum, the image pickup device holder 6 is lightweight and can be cut. Since it is unnecessary, the cost could be reduced. Hereinafter, the shape of each of these members will be described in detail with reference to FIG.

First, the image pickup device holder 6 includes the image pickup device 4
6 for inserting the plurality of pin terminal groups 4b and 4c
b and 6c are provided, and large and small round holes 11e and 11f are provided in the vicinity of the long holes 6b and 6c. on the other hand,
Large and small circular bosses 12e and 12f are provided in the filter holder 5 at positions facing the round holes 11e and 11f, respectively.
Moreover, since the notches 5a and 6a are formed at the same position on one side of the holders 5 and 6, respectively, the operator can easily recognize the vertical direction. If a mistake is made, the large circular boss 12e will not fit into the smaller round hole 11f, so that the misplacement can be immediately recognized. Similarly, a round hole 11g and an elliptical hole (or an elongated hole) 11h are formed in the mount portion 2 of the lens housing 1, and the filter holder 5 is provided at a position facing the round hole 11g and the elliptical hole 11h. , Large and small circular bosses 12g and 12h that cannot be fitted in the opposite combination are provided, respectively. Due to the above-mentioned installation direction error prevention structure,
There is no mistake in the mounting direction of the image pickup element 4 with respect to the image pickup lens.

Next, in the mount section 2 of the lens housing 1,
The window 2c for fitting and holding the optical filter 3 and the window 5c for fitting and holding the spacer rubber 7 on the optical filter holder 5 are provided.
However, since they are respectively formed, the optical filter 3 can be accurately attached to the optical filter holder 5 without any error in the twisting direction. As a result, in cooperation with the mounting direction error prevention structure, it becomes unnecessary to adjust the optical axis and the image tilt after the temporary fixing in the conventional example, and high adjustment accuracy can be obtained.

Further, the mount portion 2 has two screw holes 2
a and 2b are formed to have a predetermined height, and the screw holes 2a and 2b of the image sensor holder 6 and the filter holder 5 are formed.
Round holes 11a to 11d are formed at the positions facing each other. Then, the image pickup element holder 6 to which the image pickup element 4 is attached and the filter holder 5 are overlapped with each other, and the spacer rubber 7
And the optical filter 3 is interposed between the image pickup device 4 and the mount portion 2, and both holders 5 and 6 are simultaneously screwed into the screws 9a and 9a.
In the configuration shown in FIG. 10b, the screw holes 2a and 2b are screwed from the direction of the arrow γ through the round holes 11a to 11d, respectively. As a result, both holders 5 and 6 are attached to the mount portion 2 at the same time from the same direction, so the number of fastening points is reduced, and assembly and automation thereof are greatly facilitated.

Further, a flange surface 2f is formed around the window 2c of the mount portion 2, and the annular portion 5f of the filter holder 5 abuts and fits on the flange surface 2f. Therefore, since the thickness of the optical filter holder 5 and / or the depth of the flange surface 2f serve as a position reference between the image pickup device 4 and the image pickup lens, the position adjustment between the image pickup device and the lens can be performed only by the following adjusting method. It became so.

Here, a method of adjustment will be described with reference to FIG. In the mounting method of the present invention, the camera 10 for image processing is used instead of using the monitor for adjustment or the monitor such as CRT in the conventional method. In order to recognize the image of the image sensor 4 using the camera 10, first, the effective pixel surface of the image sensor 4 is recognized from the image obtained by the camera 10. Next, the recognized effective pixel surface is attached to the holder 6 which is a member for attaching the image pickup device.
Move to the regular position with respect to the position reference. With the effective pixel surface positioned, the image sensor 4 is attached to the image sensor holder 6 with an adhesive or the like to form an image sensor sub-assembly.

With the above-described mounting mechanism and mounting (assembling) method, the image pickup element 4 itself can be fixed by adjusting the optical axis and the image tilt with respect to the position reference, and high adjustment accuracy can be obtained. Therefore, the image sensor 4 and the optical filter 3
The relative position with and became more accurate, and the variation in the effect of the optical filter was reduced. Further, when the image pickup device 4, the image pickup lens, or the like becomes inconvenient, it is not necessary to use the automatic assembling device or the adjustment chart, and the operator disassembles and repairs such as parts replacement. Attach the sub-assembly together with the optical filter holder 5 to the screw hole 2 of the mount portion 2.
Since it suffices to screw the screws a and 2b with the screws 9c and 9d and fix them, easy assembly is possible. Therefore, the image plane position moves in the optical axis direction because the design value of the optical filter is different because the number of pixels or the spectral characteristic of the image sensor is different, or because the package of the image sensor is different, If the optical filter holder 5 is designed according to the position of the image plane,
It becomes possible to cope with the movement of the image plane position.

[0019]

As described above, according to the mounting mechanism and the mounting method of the image pickup device of the present invention, the following various excellent features are provided. (1) It is not necessary to adjust the optical axis and the image tilt after assembly. (2) No adjustment chart is required. (3) Since the image sensor itself is fixed to the image sensor holder by adjusting the optical axis and the image tilt with respect to the position reference, high adjustment accuracy can be obtained. (4) The assembly direction is unidirectional, which can contribute to automation of assembly.

(5) Since the relative position between the image pickup device and the optical filter is accurate, there is little variation in the effect of the optical filter. (6) If the image sensor holder is made of engineering plastic and aluminum sheet metal, both weight and cost can be reduced. (7) By using the structure of the holder in which the image pickup element can be attached to the image pickup lens only in the regular direction, the assembling work is sure and easy. (8) It is possible to obtain better accuracy than the related art in which the optical axis and the image tilt are adjusted using the package of the image pickup device as a reference, and the package of the image pickup device can have a compact and simple structure.

(9) The number of fastening points (number of screws) is reduced, which facilitates the assembly. (10) The image plane position moves in the optical axis direction because the design value of the optical filter differs due to the difference in the number of pixels or the spectral characteristics of the image sensor, or because the package of the image sensor differs. , If the holder is designed according to the position of the image plane, it is possible to cope with the movement of the image plane position. (11) In the event of any inconvenience occurring in the image sensor or imaging lens,
After the worker disassembles this and performs repairs such as parts replacement, it is possible to assemble easily without using an automatic assembly device.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining a mounting mechanism and a mounting method of an image sensor according to the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a completed assembled state according to the present invention.

FIG. 3 is an exploded perspective view showing the image pickup element subassembly together with a camera for image processing.

FIG. 4 is an exploded perspective view for explaining a conventional mounting mechanism and a mounting method for an image sensor.

FIG. 5 is a cross-sectional view of essential parts showing a completed assembly state according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Imaging lens housing 2 Mount parts 2c, 5c Window 2f Flange surface 3 Optical filter 4 Imaging device 5 Optical filter holder 5a, 6a Notch part 6 Imaging device holder (mounting member) 7 Spacer rubber 9a-9d Screw 10 Image processing Camera 11a-11h hole 12e-12h Circular boss

 ─────────────────────────────────────────────────── ─── Continuation of the front page Examiner Keiichi Kato (56) References JP-A-60-206377 (JP, A) SAIKAI Hei 5-43668 (JP, U) SAIKAI Shou 62-203567 (JP, U)

Claims (4)

(57) [Claims] 1. A mounting mechanism of an image pickup device, comprising an optical filter forming an image pickup optical system together with an image pickup lens and an image pickup device, which are fixed to a mount portion of an image pickup lens housing containing the image pickup lens. An image pickup lens housing is provided with two screw holes formed at a predetermined height in the mount portion, and an image having a predetermined thickness is formed between the mount portion and the image pickup element mounting member for mounting the image pickup element. An optical filter holder that also serves as a surface position adjustment is interposed, and the optical filter and a spacer rubber that elastically fixes the optical filter are interposed between the image sensor and the mount section. And an optical filter holder with an attachment member to which the image pickup device is attached, through holes respectively formed in the optical filter holder at positions facing the screw holes. An image pickup device mounting mechanism, characterized in that each screw hole is screwed into each screw hole. 2. The mounting mechanism for an image pickup device according to claim 1, wherein the image pickup device holder is formed of a sheet metal of engineering plastic and aluminum. 3. A mounting method for mounting an optical filter forming an image pickup optical system together with an image pickup lens and an image pickup element to a mount portion of an image pickup lens housing containing the image pickup lens, wherein the mount portion has two screws. An optical filter holder, which has a predetermined thickness and is used for adjusting the position of the image plane, is interposed between the image pickup element mounting member having a hole formed therein, and the image pickup element attached thereto, and the mount section. The optical filter and a spacer rubber that elastically fixes the optical filter between the mounting member and the mount portion, and faces the screw holes of the image sensor mounting member and the optical filter holder. The mounting member on which the image pickup device is mounted and the optical filter holder are screwed into the respective screw holes with two screws through the holes respectively formed at the positions. It characterized the door, the mounting method of the imaging device. 4. Positioning of an image pickup device mounting member by photographing the image pickup device with another video camera and detecting and processing the information of the optical axis of the image pickup device and the photoelectric conversion part from the image obtained from the video camera. 4. The method of mounting an image pickup device according to claim 3, wherein the image pickup device is connected to the image pickup device mounting member by aligning the optical axis and the image tilt with respect to the reference.