JPH0651246A - Chart for anamorphic lens - Google Patents

Abstract

PURPOSE:To provide a chart whereby the direction and position of rotation of a main lens and those of an anamorphic lens can easily be adjusted. CONSTITUTION:A circular chart 1 is formed on a transparent lens cap 2 which can be mounted in the front of an anamorphic lens adapter, and the anamorphic lens adapter is rotatable relative to a main lens 15, and an anamorphic lens is rotated and adjusted so that when photographed by an image pickup element (not shown in Figure) the chart shows a circular shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chart used for rotating and aligning an anamorphic lens in the vertical and horizontal directions of an image pickup device of a main lens and the vertical and horizontal directions of an anamorphic lens.

[0002]

2. Description of the Related Art Conventionally, an anamorphic lens adapter has been proposed in which an anamorphic lens adapter having different vertical and horizontal magnifications is attached to the subject side of the main lens so as to have a wider angle of view than the angle of view of the main lens. Has been done. The main lens and anamorphic lens adapter are
Each of them had its own rotation control means, and the main lens and anamorphic lens adapter were aligned vertically and horizontally.

[0003]

However, in the above-mentioned conventional example, the main lens side requires the mounting portion for mounting the anamorphic lens adapter and the rotation regulating means for regulating the rotation, which is dedicated to the mounting of the anamorphic lens adapter. I needed a lens.

Further, the anamorphic lens adapter attached to the filter screw cannot regulate the rotation, and it is very difficult to match the length and width of the image pickup device of the main lens with the length and width of the anamorphic lens.

The present invention solves these conventional problems,
An object of the present invention is to provide a chart for easily adjusting the positions of the main lens and the anamorphic lens in the rotation direction.

[0006]

According to the present invention, the chart for adjusting the rotational positions of the main lens and the anamorphic lens adapter can be attached to the subject side of the anamorphic lens. The rotation position with the lens adapter can be adjusted easily.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a first embodiment of the present invention, and FIG.
3 is a cross-sectional view of an anamorphic lens adapter equipped with the chart of FIG.

Reference numeral 1 is a rotational phase adjusting chart, and 2 is a transparent lens cap on which the chart 1 is printed.

Reference numeral 3 denotes a fixed barrel to which the lens cap 2 can be attached, 4 a cylindrical lens fitted in the fixed barrel 3, and 5 a linearly-moving barrel fixed to the fixed barrel 3 so as to be able to move straight, the rotation of which is restricted by a roller 6. Reference numeral 7 is a cylindrical lens fixed to the straight-moving barrel 5, 8 is a roller 9 which is rotatably mounted in a thrust direction and is regulated by a roller 9, and 10 is a roller 11 for engaging a roller 6 with a lead cam.
It is an operation ring that is regulated in the thrust direction and is rotatably fixed to the fixed barrel 3, and the projection 10a is engaged with the notch of the cam ring and rotates integrally with the cam ring.

Reference numeral 12 denotes a mount which has a filter screw portion 12b, is sandwiched by a tightening ring 13 in the fixed cylinder 3, is fixed to the fixed cylinder 3 when the tightening ring 13 is tightened, and is rotatable when the tightening ring 13 is loosened. .

Reference numeral 14 denotes a filter female thread portion of the main lens, 1
Reference numeral 5 denotes a lens on the subject side of the main lens.

Next, the adjusting method will be described.

First, the tightening ring 13 is rotated, and the mount 12 is tightened and fixed to the fixed barrel 3. The anamorphic lens adapter is screwed into the filter female thread portion 14, and the filter female thread portion 14 abuts on the mount abutting portion 12a of the mount 12 and is fixed to the filter portion of the main lens. At this time, the anamorphic lens adapter cannot determine at which position the rotation phase stops due to the phase difference at the beginning of cutting the filter female screw. Therefore, loosen the tightening ring 13 a little and mount 1
2 is made rotatable with respect to the fixed cylinder 3, and the cap 2 on which the circular chart 1 is printed is attached to the fixed cylinder 3. When the output image of the image pickup element is viewed in this state, the chart looks like an ellipse as shown in FIG. 3. For example, if the major axis of the ellipse is deviated from the vertical direction of the output image by θ, the anamorphic By rotating the lens adapter by θ and aligning the long axis of the ellipse with the vertical direction of the output image, it is easy to match the zooming direction of the anamorphic lens adapter with the vertical and horizontal directions of the image sensor.

In this embodiment, since the chart has a circular shape, the rotation angle of the lens cap can be freely set when the lens cap is attached to the adapter.

In the mechanical positioning, an error occurs between the zooming direction of the optical system of the anamorphic lens and the mechanical positioning, but since the zooming direction of the optical system can be directly seen in this circular chart, it is accurate. Can be positioned.

FIG. 4 shows a second embodiment.

The chart of this embodiment has a radial shape. When the chart of FIG. 4 is viewed through an anamorphic lens,
It looks like Figure 5. At this time, the zooming direction of the anamorphic lens can be known from the angle of the radial line, so that the zooming direction of the anamorphic lens adapter can be aligned with the vertical and horizontal directions of the image sensor.

Further, although the line width is wide and the number is small in this embodiment, if the number of radial lines is increased by an appropriate number, the difference in the resolution of the image pickup element due to the difference in the magnification changing direction of the anamorphic lens causes You can also adjust the zooming direction.

FIG. 6 shows a third embodiment.

Reference numeral 61 is a chart, and 62 is a protrusion provided on the cap. The anamorphic lens adapter is provided with a positioning concave portion with respect to the protrusion 62, and is positioned in the variable power direction of the anamorphic lens. With such a lens cap with a chart, an image that matches the zooming direction of the anamorphic lens can be seen.By matching the lines of the chart to the vertical or horizontal direction of the output image from the image sensor, the zooming of the anamorphic lens adapter can be changed. The direction and the vertical and horizontal directions of the output image of the image sensor can be matched.

FIG. 7 shows a fourth embodiment.

Reference numeral 7 is a lens cap, 71 is a protrusion provided on the cap 7, 72 is an ellipse chart, 7a is a major axis length of the ellipse chart, and 7b is a minor axis length of the ellipse chart. The ratio of 7b is equal to the ratio of the lateral magnification ratio and the vertical magnification ratio of the anamorphic lens adapter. A positioning recess is provided on the anamorphic lens adapter with respect to the protrusion 71, and the anamorphic lens adapter is mounted so as to be aligned so that the lateral magnification direction of the anamorphic lens adapter and the major axis direction of the ellipse chart 72 coincide with each other.

When the anamorphic lens adapter to which the ellipse chart is attached is attached to the main lens, if the vertical and horizontal directions of the image pickup element and the vertical and horizontal directions of the magnification change direction of the anamorphic lens adapter match, the output of the image pickup element is It will be a circular graphic output, and if it does not match, it will be an elliptical graphic output, so by rotating the anamorphic lens adapter so that the graphic output will be circular,
It is possible to match the vertical and horizontal directions of the anamorphic lens adapter in the magnification changing direction and the vertical and horizontal directions of the image sensor.

FIG. 8 is a perspective view of the fifth embodiment, and FIG. 9 is a plan view of FIG.

Reference numeral 8 is a cap made of a transparent material, 8a, 8b and 8c are elastically deformable tab portions, 9 is a rear cap of the anamorphic lens adapter, and 9a is
It is a brim portion that engages with the claw portions 8a, 8b, 8c.

FIG. 9 is a plan view when the rear cap 9 is engaged with the brim portion 9a and the tab portions 8a, 8b, 8c and seen from the back surface of the cap.

Reference numeral 9b is a shadow of the rear cap 9 attached to the cap 8, which can be used for adjusting the rotation angle of the anamorphic lens adapter.

As described above, a chart used for adjusting the rotation angle of the anamorphic lens adapter may be constructed by combining the member attached to the front end of the adapter with another member.

In each of the above-described embodiments, the chart is formed by printing on a transparent or transparent material, but the chart is formed by other methods such as different materials, different thicknesses, or holes. It may be configured. Furthermore, after the Ana also adjusts the Fick lens, a fixing unit for fixing the anamorphic lens to the main lens may be provided.

[0030]

As described above, according to the present invention,
By making a rotation adjustment chart attached in front of the anamorphic lens adapter, it becomes possible to easily adjust the zooming direction of the anamorphic lens and the captured image direction.

This makes it possible to easily adjust the rotational phase of the anamorphic lens adapter even with a lens that does not have a rotational phase adjusting structure of the anamorphic lens adapter, such as a dedicated lens to which the anamorphic lens adapter is attached.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the anamorphic lens adapter with the chart of the first embodiment attached.

FIG. 3 is a diagram showing a captured image of the first embodiment.

FIG. 4 is a diagram showing a figure of a chart according to a second embodiment.

FIG. 5 is a diagram showing a photographed image of a second embodiment.

FIG. 6 is a diagram showing a figure of a chart according to a third embodiment.

FIG. 7 is a diagram showing a graphic of a chart according to a fourth embodiment.

FIG. 8 is a perspective view showing a chart of a fifth embodiment.

FIG. 9 is a chart plan view of a fifth embodiment.

[Explanation of symbols]

1 ... Chart 2 ... Lens cap 3 ... Fixed barrel 4, 7 ... Cylindrical lens 5 ... Straight barrel 6, 9, 11, ...
Roller 8 ... Cam ring 12 ... Mount 13 ... Tightening ring 14 ... Filter female thread

Claims (5)

[Claims] 1. An anamorphic lens is removably attached to the anamorphic lens, and by observing the anamorphic lens while rotating it with respect to the main lens, it is possible to adjust the rotational direction of a zooming direction and a rotational direction of a captured image. Anamorphic lens chart. 2. The anamorphic lens chart according to claim 1, wherein the chart is a lens cap. 3. The anamorphic lens chart according to claim 1 or 2, wherein the chart is a circular figure. 4. The anamorphic lens chart according to claim 1 or 2, wherein the chart is a radial graphic. 5. The anamorphic lens chart according to claim 1, wherein the chart has positioning means for the anamorphic lens.