JP2000258673A - Method for positioning objective lens in solid-state imaging device, coupler for solid imaging device and jig for fixing coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To align the center of the external size reference of a coupler with the optical axis of an objective lens in a solid-state imaging device constituted by fixing a solid state imaging element and the objective lens in the coupler formed to be nearly cylindrical. SOLUTION: This method is the method for positioning the objective lens 4 in the solid state imaging device constituted by fixing the solid state imaging element 11 and the objective lens 4 on the coupler 1 formed to be nearly cylindrical. The coupler 1 where the element 11 is fixed is fixed at the external size reference by a coupler fixing jig 8, and the lens 4 is rotated so that the center of a reticle 14 provided in the ocular 6b of a microscope 6 is aligned with the center of the coupler 1, further the optical axis of the lens 4 is nearly aligned with the center of the coupler 1, the center of a objective reticle 15 positioned between the lens 4 and the microscope 6 is aligned with the center of the reticle 14 in the ocular and the center of the coupler 1, and the center of the subject reticle 15 is aligned with the center of a monitor 13 which viewing a video fetched through the lens 4 from the element 11 on the monitor 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-state image pickup device in which a solid-state image pickup device and an objective lens are fixed to a substantially cylindrical coupler, and the center of the coupler based on the outer shape reference and the optical axis of the objective lens can be easily and reliably set. Regarding matching technology.

[0002]

2. Description of the Related Art For example, a solid-state imaging device a used for an endoscope or the like includes a cylindrical component b called a coupler, a solid-state imaging device c such as a charge-coupled device (CCD), an optical filter d, and an objective. It is formed by fixing the lens e (see FIG. 7).

In the solid-state imaging device a, it is necessary that the optical axis of the objective lens e coincides with the effective pixel center of the solid-state imaging device c. In particular, 2
In a stereoscopic endoscope having three solid-state imaging devices and capable of stereoscopic vision, the optical axis of the objective lens and the effective pixel center of the solid-state imaging device in each of the two solid-state imaging devices coincide with each other. Is necessary to enable stereoscopic vision.

Conventionally, in order to align the optical axis of the objective lens with the center of the effective pixel of the solid-state imaging device, the center of the coupler based on the outer shape reference and the center of the effective pixel of the solid-state imaging device are fixed and the objective lens is mounted. Was. Since the optical axis of the objective lens was considered to be centered on the basis of the outer shape of the objective lens, if the coaxiality of the outer shape of the coupler and the hole for inserting the lens was given with processing accuracy, the center of the outer shape of the coupler would be the center. This is because it has been considered that the optical axis of the objective lens and the effective pixel center of the solid-state imaging device coincide with each other by matching the effective pixel center of the solid-state imaging device.

[0005]

However, the objective lens is composed of parts such as glass (lens) and a lens barrel, and each is made by machining. And the optical axis of the objective lens do not always match. Therefore, even when assembled by the above-described means, the effective pixel center of the solid-state image sensor often does not coincide with the optical axis of the objective lens.

For this reason, even if such a solid-state imaging device is mounted on a component called a two-precision head holder,
In many cases, stereoscopic vision was not possible. This is because, when performing stereoscopic vision, it is necessary that the images captured by the two solid-state imaging devices coincide in the height direction (Y direction) and the rotation direction (θ direction). This is because if the difference between the effective pixel center of the solid-state image sensor and the effective pixel center occurs, the deviation is not guaranteed.

Accordingly, the present invention provides a solid-state image pickup device in which a solid-state image pickup device and an objective lens are fixed to a substantially cylindrical coupler, and the center of the coupler and the optical axis of the objective lens easily and reliably coincide with each other. The task is to make

[0008]

According to the present invention, there is provided a method for positioning an objective lens in a solid-state imaging device, the method comprising: rotating an objective lens with respect to a coupler to which a solid-state imaging device is fixed; The objective lens is fixed to the coupler after the optical axis of the objective lens is aligned with the center of the outer shape reference of the coupler while watching the image output from the imaging element.

Therefore, in the method of positioning the objective lens in the solid-state imaging device according to the present invention, the center based on the outer shape reference of the coupler and the optical axis of the objective lens can be matched.

The solid-state image pickup device of the present invention has a cut surface provided on at least a part of the outer peripheral surface, and an arc surface provided on another part of the outer peripheral surface.

Therefore, in the coupler of the solid-state imaging device according to the present invention, by fixing the position with reference to the cut surface, it is possible to easily and reliably locate the center with respect to the outer shape.

According to the present invention, there is provided a coupler fixing jig having a substantially cylindrical shape, a cut surface provided on at least a portion of an outer peripheral surface, and an arc surface provided on another portion of the outer peripheral surface. It is one that is sandwiched and fixed by the clamping portion, and a plane corresponding to the cut surface of the coupler is provided in one clamping portion, and a V-shaped cut surface corresponding to the arc surface of the coupler is provided in the other clamping portion. is there.

Therefore, in the jig for fixing the coupler of the present invention, by setting the plane corresponding to the cut surface of the coupler as the reference plane, the coupler can be reliably held and the center of the coupler based on the outer shape reference is determined. Positioning can be performed easily and reliably.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the method of positioning an objective lens in a solid-state imaging device according to the present invention, first, means for matching a center based on the outer diameter of the coupler with a center of a chart as a subject is constructed, and a method based on the outer diameter of the coupler is constructed. A deviation between the center and the optical axis of the objective lens can be measured, and then a means for correcting the optical axis deviation of the objective lens is provided.

For this purpose, a coupler 1 as shown in FIG. 1 is used.

The coupler 1 has a substantially cylindrical shape, has a flat cut surface 2 on a part of the outer peripheral surface thereof, and has an outer shape having an arc surface 3 on the opposite side of the cut surface 2.

The system for positioning the objective lens 4 with respect to the coupler 1 is roughly composed of a microscope, an XYZ alignment jig, a camera unit, and a monitor (see FIG. 2).

An XYZ alignment jig 5 is fixed to an XY table 7 on a microscope 6, a coupler fixing section for fixing the coupler 1, holding the objective lens 4, and vertically.
That is, it is constituted by a lens support portion that moves in the optical axis direction, and a chart holder.

The coupler fixing section 8 includes a fixing section 9 and the fixing section 9.
And a movable part 10 which comes into contact with and separates from the fixed part 9, the fixed part 9 has a reference surface 9 a for positioning the cut surface 2 of the coupler 1, and the movable part 10 has a V-shape which presses the circular arc surface 3 of the coupler 1. (See FIG. 1).

The microscope 6 has an objective lens 6a having a magnification of 20 times and an eyepiece 6b having a magnification of 10 times, that is, a total of 200 times. The XY table 7 has a counter function, and can measure the movement amount in units of 1 μm. I have.

An optical filter (not shown) and a CCD 11 are already fixed to the coupler 1 (in FIG.
And the CCD 11 are shown separately. ). Also, since the coupler 1 (specifically, the CCD 11) is connected to the camera unit 12, and the camera unit 12 is connected to the monitor 13, if the objective lens 4 is aligned and mounted, the image of the subject can be monitored. You can see it in Note that the CCD 11 is based on the outer shape of the coupler 1,
The center of the effective pixel and the center of the coupler are fixed to the coupler 1 after being matched with very high precision.

While pressing the cut surface 2 of the coupler 1 against the reference surface 9 a of the fixing portion 9 of the coupler fixing portion 8, the movable portion 10 is brought close to the fixing portion 9, and the V-shaped pressing surface 10 a forms an arc surface of the coupler 1. Hold down 3 and chuck coupler 1. Since the center of the coupler 1 is centered in the Y direction by the pressing surface 10a of the movable portion 10, the centering is always performed even if the coupler 1 having a different diameter is inserted (see FIG. 1).

Next, X having a counter function of the microscope 6
Using the Y-table 7 and the cross reticle 14 attached to the eyepiece 6b, the center of the coupler 1 based on the outer shape is set as the origin (0, 0).

That is, the origin search in the Y direction will be described with reference to FIG. 4. First, one end face 3a of the arc surface 3 of the coupler 1 in the Y direction is adjusted to the Y direction reference line 14a of the cross reticle 14, and the counter is set to Y. Reset to direction 0 (see FIG. 4A).

Next, the XY table 7 is fed by a predetermined amount in the Y direction. For example, if the outer diameter of the coupler 1 is 5.812 mm, the counter is fed 2.906 mm, and the counter is reset to 0 in the Y direction (see FIGS. 4 (2) and (3)). Next, the XY table 7 is fed in the same direction, and the distance of the arc surface 3 of the coupler 1 to the other end surface 3b in the Y direction is 2.
After confirming that the distance is 906 mm, the origin search in the Y direction is completed (see FIG. 4 (4)). At this time, ± 0.00
A tolerance of 1 mm shall be allowed.

Next, the origin is set in the X direction (see FIG. 5).

First, the counter is reset to 0 in the X direction by aligning one end face 3c of the arc surface 3 of the coupler 1 in the X direction with the X direction reference line 14b of the cross reticle 14 (see FIG. 5A). Next, the XY table 7 is moved 2.906 mm in the X direction, whereupon the counter is reset to 0 in the X direction (see FIG. 5 (2)). Then, the XY table 7 is sent in the same direction, and it is confirmed that the distance from the arc surface 3 of the coupler 1 to the cut surface 2 which is the other end surface in the X direction is 2.906 mm, and the origin search in the X direction is completed. (See FIG. 5 (3)). At this time, ± 0.
A tolerance of 001 mm is allowed.

As described above, the setting of the center of the coupler 1 based on the outer diameter as the origin (0, 0) is completed.

At this time, by aligning the center of the cross reticle 14 attached to the eyepiece 6b with the center of the reticle (subject) 15 on the reticle holder (not shown) of the XYZ alignment jig 5, the optical axis of the microscope 6 is adjusted. The center of the reticle 13 of the XYZ alignment jig 5 coincides with the center of the coupler 1 (see FIG. 3). For this reason,
If the center of the object reticle 15 on the XYZ alignment jig 5 coincides with the center of the monitor 13 when this image is projected on the monitor 13, it can be confirmed that the optical axis of the objective lens 4 also coincides with the other centers. it can.

By the way, in order to capture a focused image, the position of the cross reticle 15 as a subject is fixed (the distance from the objective lens 4 is about 5 to 20 mm).
It is necessary to adjust the distance from the CCD 11 while moving the objective lens 4 up and down while watching the image. This is performed by turning a screw (not shown) for adjusting the Z-axis of the XYZ alignment jig 5. Then, the subject reticle 1 in the focused state
Measure how much the center of 5 deviates from the center of the monitor. At this time, a mark (mark) 16 is put on the upper surface of the lens barrel 4a of the objective lens 4, and the mark 16 is rotated by 90 degrees, and the center of the subject reticle 15 at that time and the monitor 1 are rotated.
Check the deviation from the center of 3 (see (1) to (4) in FIG. 6).
This indicates the tendency of deviation. In FIG. 6, the monitor screen 13
a marking line 16 attached to the lens barrel 4a of the objective lens 4
Indicates the position of. In the example shown in FIG.
In the state shown in (4), the Y direction reference line 15a of the subject reticle 15 matches the Y direction reference line 17a of the cross reticle 17 drawn on the screen of the monitor 13 (14 （0).
State.

Empirically, in order to stereoscopically view two images on a 14-inch monitor, the shift between the two images in the vertical (Y) direction must be within 2 mm. However, when the objective lens 4 is turned while the object is in focus, the monitor 13
A deviation of up to about 6 mm occurs on the top. 1/4 in optical system
When using an inch CCD, 14ＣＣＤ1 / 4 = 56 times and C
The shift amount on the CD becomes 56 times on the monitor. 6mm ÷ 5
6 ≒ 100 μm, and a shift of about 50 μm from the lens center may occur.

When the objective lens 4 is rotated by 360 °, the center of the object reticle 15 projected on the monitor 13 is always aligned with the center of the monitor 13 (Y direction) unless the center of the effective pixel of the CCD 11 is deviated from the center of the coupler 1. Point). In this case, the centers do not coincide in the X direction, but a slight shift in the X direction does not pose a problem in stereoscopic viewing. Thus, the center (Y direction) of the object reticle 15 is monitored while the objective lens is rotated. By finding and fixing a point that coincides with the center of the objective lens 4, it is possible to make the center of the outer shape reference of the coupler 1 coincide with the optical axis of the objective lens 4.

As described above, by setting the object lens 4 on the XYZ alignment jig 5 and adjusting the position of the objective lens 4 with respect to the coupler 1, the center of the coupler 1 on the basis of the outer shape and the optical axis of the objective lens 4 are always ensured. Can be matched. For this reason, as long as the solid-state imaging device in which the position of the objective lens 4 is adjusted as described above, a camera capable of stereoscopic viewing can be manufactured regardless of the combination used.

Conventionally, since the optical axis of the objective lens 4 is deviated from the center of the coupler 1, when a plurality of solid-state imaging devices are manufactured, it is necessary to select the same one of them and perform pairing. , Stereoscopic vision could not be guaranteed. By implementing the present invention, the pairing operation is omitted. Also,
If there is no optical system having the same amount of displacement, conventionally a defective product is obtained, but this is also eliminated, and the yield is improved.

Further, as described above, since the coupler 1 has the cut surface 2, the position in the rotation direction is always determined when chucking is performed by the coupler fixing unit 8. Also, arc surface 3
Therefore, the center of the coupler 1 and the optical axis of the microscope 6 set first can be accurately chucked in the Y direction.

It should be noted that the shapes and structures of the respective parts shown in the above-described embodiments are merely examples of the specific embodiments to be carried out when carrying out the present invention. The scope should not be construed as limiting.

[0038]

As is apparent from the above description, the method of positioning the objective lens in the solid-state imaging device according to the present invention is a solid-state imaging device in which the solid-state imaging device and the objective lens are fixed to a substantially cylindrical coupler. Is a method of positioning the objective lens in which the optical axis of the objective lens is positioned at the center with respect to the outer shape reference of the coupler while watching an image output from the solid-state imaging device while rotating the objective lens with respect to the coupler to which the solid-state imaging device is fixed. And then fixing the objective lens to the coupler.

Therefore, in the method of positioning the objective lens in the solid-state imaging device of the present invention, the center based on the outer shape of the coupler and the optical axis of the objective lens can be simply and reliably matched.

According to the second aspect of the present invention, the coupler is fixed by the coupler fixing jig on the basis of the outer shape, and the center of the reticle provided in the eyepiece of the microscope coincides with the center of the coupler. The optical axis of the objective lens almost coincides with the center of the coupler, and the center of the object reticle located between the objective lens and the microscope coincides with the center of the reticle in the eyepiece and the center of the coupler. While viewing the image captured through the lens on the monitor, the objective lens is rotated so that the center of the subject reticle matches the center of the monitor, so that the center of the subject reticle matches the center of the monitor on the monitor. By simply rotating the objective lens, the optical axis of the objective lens can be aligned with the center of the outer diameter of the coupler, and the Positioning to easily and reliably performed is possible.

The coupler of the solid-state imaging device according to the present invention is a coupler of a solid-state imaging device having a substantially cylindrical shape and fixing a solid-state imaging device and an objective lens, wherein at least a part of the outer peripheral surface is provided with a cut surface. Characterized in that an arcuate surface is provided in another part of.

Accordingly, in the coupler of the solid-state imaging device according to the present invention, the center can be easily and reliably located on the basis of the outer shape by fixing the position with reference to the cut surface.

The coupler fixing jig of the present invention fixes a coupler of a solid-state imaging device having a substantially cylindrical shape, a cut surface provided on at least a part of the outer peripheral surface, and an arc surface provided on another part of the outer peripheral surface. A jig for fixing a coupler, wherein a flat surface corresponding to a cut surface of the coupler is provided on one holding portion, and a V-shaped cut surface corresponding to an arc surface of the coupler is provided on the other holding portion.

Therefore, in the jig for fixing the coupler of the present invention, by setting the plane corresponding to the cut surface of the coupler as the reference plane, the coupler can be securely held and the center of the coupler based on the outer shape reference can be obtained. Positioning can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a coupler is fixed by a coupler fixing jig.

FIG. 2 is a schematic diagram of a system for positioning an objective lens with respect to a coupler.

FIG. 3 is a schematic perspective view showing a positional relationship of each element during a positioning operation of an objective lens.

FIG. 4 is a diagram for explaining a procedure for finding the origin in the Y direction.

FIG. 5 is a diagram for explaining a procedure for finding an origin in the X direction.

FIG. 6 is a schematic diagram of a monitor showing a measurement state of a deviation between a subject reticle and the center of the monitor on the monitor.

FIG. 7 is a longitudinal sectional view illustrating an example of a solid-state imaging device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coupler, 2 ... cut surface, 3 ... Arc surface, 4 ... Objective lens, 6 ... Microscope, 6b ... Eyepiece, 8 ... Coupler fixing part (coupler fixing jig), 9 ... Fixed part (one clamping part) ),
9a: reference surface (flat surface), 10: movable portion (the other holding portion), 10a: holding surface (V-shaped cut surface), 11: CCD
(Solid-state image sensor), 13 monitor, 14 reticle in eyepiece, 15 subject reticle

Claims (4)

[Claims] 1. A method for positioning an objective lens in a solid-state imaging device comprising a solid-state imaging device and an objective lens fixed to a substantially cylindrical coupler, wherein the objective lens is positioned relative to the coupler to which the solid-state imaging device is fixed. Positioning the objective lens in the solid-state imaging device, wherein the image output from the solid-state imaging device is rotated and the optical axis of the objective lens is aligned with the center of the outer shape reference of the coupler, and then the objective lens is fixed to the coupler. Method. 2. A coupler is fixed on the basis of an outer shape by a jig for fixing a coupler, the center of a reticle provided in an eyepiece of a microscope is made to coincide with the center of the coupler, and the optical axis of the objective lens is set at the center of the coupler. Align the center of the object reticle positioned between the objective lens and the microscope with the center of the reticle in the eyepiece and the center of the coupler, and view the image captured from the solid-state imaging device through the objective lens on the monitor. 2. The method according to claim 1, wherein the objective lens is rotated such that the center of the object reticle coincides with the center of the monitor. 3. A coupler of a solid-state imaging device having a substantially cylindrical shape and fixing a solid-state imaging device and an objective lens, wherein a cut surface is provided on at least a part of an outer peripheral surface, and an arc surface is provided on another part of the outer peripheral surface. A coupler for a solid-state imaging device, comprising: 4. A coupler fixing jig for fixing a coupler of a solid-state imaging device having a substantially cylindrical shape, a cut surface provided on at least a part of an outer peripheral surface, and an arc surface provided on another part of the outer peripheral surface. A jig for fixing a coupler, wherein a flat surface corresponding to a cut surface of a coupler is provided on one holding portion, and a V-shaped cut surface corresponding to an arc surface of the coupler is provided on the other holding portion.