JP2666913B2 - How to attach the image sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for mounting an image sensor, and more particularly, to a method for mounting an image sensor at a correct position and orientation with respect to a photographing lens of a video camera, an electronic still camera, or the like.

[0002]

2. Description of the Related Art Generally, in an image pickup apparatus using an image pickup device, it is necessary to attach the image pickup device to a photographing lens at a correct position and posture. That is, the position in the three orthogonal directions is adjusted so that the optical axis of the photographing lens coincides with the center of the image sensor, and the angle around each of the three orthogonal axes is adjusted so that the image sensor has a predetermined posture. Need to be installed.

Conventionally, an adjusting mechanism is provided in advance, and the adjusting mechanism is used to mount the image pickup device at a correct position and posture, or divided into two members, a lens barrel and an image pickup device holding member on which the image pickup device is mounted. Three methods were used: a method of providing a reference member with which these members abut, adjusting the two members with respect to the reference member, managing the numerical values and combining them, and a method of partially combining the above. .

[0004]

However, any of these mounting methods of an image sensor requires an adjusting mechanism for adjusting the position and orientation of the image sensor, which leads to an increase in cost and space, and There is a problem that it takes time to adjust. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method of mounting an image sensor that does not require a special adjustment mechanism, can be easily adjusted, and has high accuracy.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an image pickup device having an image pickup device mounted on a lens barrel such that the image pickup device is mounted in a correct position and orientation with respect to a photographing lens. In the method of attaching an image pickup element to which an element holding member is attached, the lens barrel and the image pickup element holding member are each formed of plastic, and a plurality of convex portions respectively facing the outer periphery of each of these mounting surfaces are integrally formed of plastic. After fixing the lens barrel and the imaging device holding member to the jig, adjusting the position and orientation between them, and fixing or temporarily fixing the opposed convex portions by heat welding in the adjusted state. It is characterized by doing.

[0006]

According to the present invention, a convex portion for heat welding between the lens barrel and the image pickup element holding member is previously formed integrally with the lens barrel and the image pickup element holding member using plastic. Then, the lens barrel and the image pickup device holding member are fixed to a jig, respectively, and the position and posture between the two are adjusted so that the image pickup device can be attached to the photographing lens at the correct position and posture. After that, in the adjusted state, the opposing convex portions are melted by ironing or the like, and the two are fixed or temporarily fixed by heat welding.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for mounting an image pickup device according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a sectional view of a main part of an image pickup apparatus used for explaining a method of mounting an image pickup element according to the present invention. As shown in FIG. 1, the imaging apparatus includes two members, a lens barrel 10 and an imaging element holding member 20.

The lens barrel 10 including the taking lens 12 is made of plastic, and a plurality of convex portions 14 for heat welding are integrally formed on the outer periphery of a mounting surface to which the image pickup device holding member 20 is fixed. ing. On the other hand, the image pickup device (CCD) 22 is fixed to a CCD reference plate 24, and the CCD reference plate 24 is screwed to the image pickup device holding member 20 by screws 26. This imaging element holding member 20
Is formed of plastic similarly to the lens barrel 10, and a plurality of convex portions 28 are integrally formed on the outer periphery of the mounting surface to the lens barrel 10 so as to face the convex portions 14 on the lens barrel side. ing. The lens barrel 10 and the imaging element holding member 20 are assembled without any adjustment. Each of the convex portions 14 and 28 is formed in a semi-cylindrical shape.

Next, a description will be given of a method of adjusting the mutual position and posture of the lens barrel 10 and the image pickup device holding member 20 having the above-described structure, and connecting them. First, the lens barrel 10
An O-ring 30 is interposed between the image pickup device holding member 20 and each of the O-rings 30 and fixed to an adjustment jig (not shown). Then, the position and posture between the two are adjusted so as to satisfy the performance. At this time, the convex portion 14 of the lens barrel 10 and the convex portion 28 of the imaging element holding member 20 face each other with an appropriate gap.

[0010] Then, in the adjusted state, the opposing convex portions are melted by ironing with 32, and the two are fixed (temporarily fixed) by heat welding. Numeral 34 indicates a heat-welded portion integrated by heat-welding. FIG. 2 (A)
(B) and (B) each show an example of a processing step after thermal welding. There is a gap between the lens barrel 10 and the imaging element holding member 20 other than the heat-welded portion 34, and there is a possibility that dust enters and light leaks from this gap. Therefore, FIG.
As shown in FIG. 2A, the gap is filled with a sealing adhesive 36, or as shown in FIG.
8 is wound around.

As a method of fixing the lens barrel 10 and the image pickup element holding member 20 with an appropriate gap, it is conceivable to use an adhesive, but in this case, the tact time is long and the adhesive is contracted. There are problems such as deformation.

[0012]

As described above, according to the method for mounting an image pickup device according to the present invention, no adjustment mechanism is required for mounting the image pickup device on the lens barrel at a correct position and posture, so that the size and cost can be reduced. Adjustment is performed only when the lens barrel and the image sensor holding member are connected, which contributes to downtime.Therefore, complicated processes and accuracy control are not required. Absent. Furthermore, the tact time is shorter than that of bonding or the like, and there is little concern about changes over time, and the performance can be stabilized at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an image pickup apparatus used for explaining a method of mounting an image pickup element according to the present invention.

2 (A) and 2 (B) are diagrams each showing an example of a processing step after thermal welding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lens barrel 12 ... Photographing lens 14, 28 ... Convex part 20 ... Image sensor holding member 22 ... Image sensor (CCD) 24 ... CCD reference plate 30 ... O-ring 32 ... Ironing 34 ... Heat welding part 36 ... Adhesion Agent 38… Tape

Claims (1)

(57) [Claims] 1. A method of attaching an image sensor to a lens barrel so that the image sensor is mounted in a correct position and posture with respect to a photographing lens. The torso and the imaging element holding member are each formed of plastic, and a plurality of convex portions respectively facing the outer periphery of each of these mounting surfaces are integrally formed of plastic, and the lens barrel and the imaging element holding member are each formed into a jig. A method for mounting an imaging device, comprising: fixing and temporarily fixing the opposed convex portions by heat-welding the adjusted convex portions after adjusting the position and orientation between the two.