JP2001166142A - Filter for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter of a camera for a special effect, which is constituted so that reflection of natural light on the objective body is converted into the reflected light with interference color tone and that the reflected light can be visualized in an image with a normal image. SOLUTION: The filter for a camera consists of an optically anisotropic film and a polarizing filter having a proper axial angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special effect filter capable of expressing an interference color of circular dichroism in a photographed image when reflected light from a subject becomes partially polarized light in photographing or the like.

[0002]

2. Description of the Related Art Conventionally, interference colors in optical anisotropy which can be viewed with a polarizing microscope or the like are obtained by inserting a sample between two polarizers.

Therefore, in general photographing, interference color in optical anisotropy has not been photographed.

[0004]

SUMMARY OF THE INVENTION The present invention provides a special effect filter for a special effect in which a filter for a special effect changes the reflection of natural light in a subject into a reflected light having a color tone of an interference color and can be expressed together with a normal image. It aims to provide camera filters.

[0005]

In order to achieve the above object, the present invention utilizes partial polarization due to reflection of natural light.

Conventionally, when compared with interference colors in optical anisotropy that can be viewed with a polarizing microscope, what corresponds to a polarizer of a polarizing microscope is not included except claim 5 of the present invention. Next, a film having an optical anisotropy corresponds to a sample of a polarizing microscope, which is combined with a polarizing filter while maintaining an appropriate axis angle. The polarizing filter corresponds to the analyzer of the polarizing microscope.

[0007] As described above, the filter comprises the optically anisotropic film and the polarizing filter.

The filter of the present invention is mounted on a camera and used by rotating the filter. This is because an interference color appears when the polarization axis of the filter is parallel or orthogonal to the polarization axis of the filter due to rotation and the partial polarization due to reflection. The interference color becomes partially polarized light when natural light is reflected by an object, and depends on the polarization axis and intensity. Therefore, the interference color of circular dichroism appears in all or part of the reflection of natural light in the subject.

As described above, the filter works, so that a normal image and an image having a color tone of an interference color in reflected light and the like are both present, and a special image can be expressed.

It is also possible to mount the above-mentioned filter on an illumination light, and it is a light for a special effect that reflects an interference color on partial polarization due to reflection of the illumination light.

Further, the above-mentioned filter can be used as polarized glasses for glasses, and is a polarized glasses that exhibits interference colors in which the color tone is adjusted to partial polarization due to strong reflection.

[0012]

FIG. 1 is a diagram for explaining the present invention in an easily understood manner. The partially polarized light in the subject becomes elliptically polarized light by transmitting through one film. At this time, light other than the polarization element in the subject is transmitted without change. The film is a plastic film or the like having optical anisotropy, and a resin film such as polyester has good optical transparency and is obtained by processing a plastic film into a uniaxially oriented film.

Since the partially polarized light in the subject has a polarization axis and intensity due to the polarization angle, the polarization axis is rotated by 45 ° with respect to the y axis in FIG. Since the film No. 1 is a uniaxially oriented film, the linearly polarized light from the subject becomes elliptically polarized light which draws a circle on the y and z axes as shown in FIG. 5 due to the optical anisotropy. Since the uniaxially oriented film has a state in which polymer chains are arranged on the y-axis or the z-axis of the x, y, and z axes, the birefringence has a slightly different refractive index between the y-axis and the z-axis.
For this reason, the partially polarized light exhibits an interference color with respect to the original light source color due to interference of the specific light wavelength by the birefringence of the film and the polarizing filter of the second.

The interference color of circular dichroism is a phenomenon that is prominently displayed at a position where the polarization axis of the partially polarized light in the object and the polarization axis of the two polarization filters are maintained at 45 ° with respect to the z axis in FIG. is there. When the partial polarization axis in the subject and the polarization axes of the two polarization filters are parallel or orthogonal, two different interference colors appear because they show different interference colors.

When one optically anisotropic film is a multiaxially oriented film such as a biaxially oriented film with respect to the y and z axes, a multicolored film corresponding to the multiaxial orientation besides the two interference colors is used. Interference color appears. For example, when processed into a biaxially oriented film at an angle of 45 ° on the y- and z-axis planes, four interference colors appear.

Here, a description will be given in comparison with a polarizing microscope. Partially polarized light in a subject corresponds to a polarizer of the polarizing microscope. Since the polarization axis and the intensity of the partially polarized light in the subject depend on the incident angle of light, the polarization axis and the intensity are often different. As described above, since the interference color of circular dichroism appears when the polarization axis of the partially polarized light and the polarization axis of the two polarization filters are parallel or orthogonal, the interference color does not appear in all the light from the subject. . Many lights may pass through this filter without changing the color tone. On the other hand, since the partially polarized light in the subject that satisfies the above conditions corresponds to a polarizer of a polarizing microscope, the film 1 in FIG. 1 has a polarization microscope sample that converts linearly polarized light into circularly polarized light with a neutral axis (45 °). Can be considered. The wave plate is a compensator for displaying a sensitive color, and utilizes an interference color of circular dichroism. The polarizing filter 2 in FIG. 1 corresponds to the analyzer of the polarizing microscope. The polarization filter of 2 is 1 if it is kept at 45 ° with respect to the y and z axes.
The film shows interference colors in optical anisotropy.

Since the filter of the present invention which exhibits the interference color of circular dichroism does not have a polarizer corresponding to a polarizer of a polarizing microscope, an image obtained by photographing a subject is reflected by a normal image and reflected light as described above. This is a camera filter that can display special effects as images, with images having interference color tones along with light.

FIG. 2 shows a special effect camera in which the orientation axis of the optically anisotropic film 1 and the polarization axis of the polarizing filter 2 are fixed at 45 ° to the y-axis and the z-axis in FIG. Filter. This filter has a rotating frame 3 rotatable in a plane orthogonal to the x-axis in FIG. 1 and is rotatable so as to maintain a polarization axis corresponding to the polarization axis in the subject. In fact,
When the partial polarization in the subject appears when the two polarization filters are parallel or orthogonal to the sagittal polarization from the water surface, or when the filter's polarization axis rotates 90 ° in the vertical and horizontal positions of the camera, it is rotated. Frame 3 is required.

FIG. 3 shows a special effect camera filter having a rotating frame provided so that the optically anisotropic film 1 and the polarizing filter 2 can be rotated in a plane perpendicular to the x-axis in FIG. It is. This filter has a rotating frame 4 and is useful for weakening the color tone of the interference color. The rotating frame 4 has a built-in guide frame provided with a click stop every 45 ° from the y-axis and displays the guide frame. It was previously mentioned that the two polarizing filters appeared prominently in the interference color at an angle of 45 ° with respect to the y and z axes in FIG. When the polarizing filters are parallel or orthogonal, the partial polarized light in the subject does not become elliptically polarized light in one film. Therefore, no interference color appears. This state can be regarded as the same as a normal polarizing filter.
When one filter is not on the neutral axis (45 °), the color tone of the interference color is weakened. No interference color appears when the second polarizing filter is at an angle of 45 ° with respect to the partially polarized light in the subject.
As described above, the filter of FIG. 3 is a camera filter having both a function as a special effect filter and a function as a polarizing filter.

FIG. 8 shows a special effect camera filter using an optically anisotropic film only at the center for use in a wide-angle lens. Some optically anisotropic films may cause interference colors when the angle of view becomes large. To cope with such problems, an optically anisotropic film having a circular shape or the like is used at the center. In this case, the image at the center shows the above-mentioned special effect, but the periphery has only the function of a polarizing filter.

FIG. 4 shows an optically anisotropic film adapter used in addition to the filters shown in FIGS. The circular dichroism of the uniaxially oriented film has already been described,
The adapter shown in FIG. 4 was processed into a uniaxially oriented film with respect to the y-axis or the z-axis shown in FIG. 1 so that the axial direction was parallel to the filters shown in FIGS. . As shown in FIG. 5, the uniaxially oriented film has birefringence characteristics in which the refractive indices are slightly different between the y-axis and the z-axis. Birefringence varies from one film. Since it is known that the change in birefringence affects the interference color, it is possible to convert the color tone of the interference color by installing the adapter of FIG. 4 on the front surface of the filter of FIGS.
It is also possible to mount the filter shown in FIGS. 2 and 3 not only on the front surface but also on the rear surface, invert the filter itself, and make the filter incident from the rear surface. In this case, interference colors with different tones can be provided for the front surface and the rear surface.

Further, by using the second polarizing filter as a circular polarizing filter corresponding to a camera having a half mirror or a prism in the optical path, it is possible to correct excess or deficiency of exposure. In this case, only the polarized light that enters the camera lens from the polarizing filter 2 in FIG. 1 is circularly polarized light, and does not affect the interference color of the circular dichroism.

FIG. 6 shows an adapter for a polarizing filter used in addition to the filter of the camera shown in FIGS. As described above, a circular polarization dichroism interference color appears on the entire subject by additionally using a polarizer equivalent to a polarizer with a polarizing microscope as described above.

In the case where the filter of the camera shown in FIG. 3 has the function of a normal polarizing filter, the light quantity of the exposure of the camera can be adjusted by attaching and rotating the polarizing filter as an adapter.

There is an effective use method for performing studio photography using the above-described effects. When the back paper is replaced with a polarizing film sheet and the backlight is evenly applied from the back of the polarizing film sheet, the background corresponds to the partial polarization in the subject as described above. Therefore, the background color can be easily changed by the fitter operation.

The filter of the camera shown in FIGS. 2 and 3 can be mounted on a light for illumination. When used in a lighting fixture, a light beam that goes backwards in the x-axis in FIG. 1 illuminates the subject. As described above, the luminous flux has both the function of ordinary illumination and the function of illumination in which reflected light produces partial polarization due to the reflection angle and exhibits an interference color according to the polarization axis and intensity. The color of the reflected light changes depending on whether the color tone of the interference color differs between parallel and orthogonal to the polarization axis, and the intensity of the partial polarization. This color tone also depends on the distribution of the spectral energy of the light source of the lighting equipment. As described above, when illuminating the subject, the polarization axis and the intensity of the polarized light are determined from the reflection angle of the reflected light. Therefore, if the filter is attached to the adjusted illumination light, the function of illuminating the subject and the specific reflection can be achieved. This is a special effect light in which light having circular dichroism interference color is integrated with the light.
Moreover, the adapter of FIGS. 4 and 6 can be used.

The filter of the camera of FIG. 2 can be used as eyeglasses. When a film having optical anisotropy is brought into close contact with general polarizing glasses in the configuration shown in FIG. 2, the above-described filter effect can be obtained. Although these glasses have a slightly weaker effect of cutting off the reflection of natural light like ordinary polarized glasses,
If the reflection of natural light gives rise to partial polarization, it produces a visual effect as a weakened reflected light having a hue of an interference color.

[0028]

As described above, the present invention is mounted on a camera and used by rotating the filter itself. This is because when the polarization axis of the filter is parallel or perpendicular to the polarization axis of the object due to rotation, a noticeable interference color appears. An image by this filter is a normal image and an image having a color tone of an interference color in reflected light or the like, so that a special effect can be expressed as an image. It is also possible to mount the above-mentioned filter on a light for illumination, and it is a light for a special effect which shows an interference color in partial polarization due to reflection. When the above-mentioned filter is used as eyeglasses, the reflection of natural light is weakened while having the adjusted interference color tone.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a filter of a camera according to the present invention.

FIG. 2 is a filter diagram of the camera of the present invention.

FIG. 3 is a filter diagram of the camera of the present invention.

FIG. 4 is an adapter diagram of a filter of the camera of the present invention.

FIG. 5 is a drawing of elliptically polarized light of a uniaxially oriented film.

FIG. 6 is a polarization filter adapter diagram of the filter of the camera of the present invention.

FIG. 7 is a table showing reflection coefficients Rs and Rp of S-polarized light and P-polarized light.

FIG. 8 is a filter diagram of the camera of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optically anisotropic film 2 Polarizing filter 3 Rotating frame 4 Rotating frame 5 Polarizing filter

[Procedure amendment]

[Submission date] December 5, 2000 (200.12.
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

The filter of the present invention is mounted on a camera and used by rotating the filter. When the polarization direction of partially polarized light by reflection and the polarization direction of the filter by rotation orthogonal or parallel, because interference color appears. The interference color becomes partially polarized light when natural light is reflected by an object, and depends on the intensity of the polarized light. Therefore, the interference color of circular dichroism appears in all or part of the reflection of natural light in the subject.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013] Since the partial polarization in the subject has a strength of polarization due to the polarization angle, and 45 ° rotated relative to the y-axis the polarization axis in FIG. Since the film No. 1 is a uniaxially oriented film, the linearly polarized light from the subject becomes elliptically polarized light which draws a circle on the y and z planes as shown in FIG. 5 due to the optical anisotropy. Since the uniaxially oriented film has a state in which polymer chains are arranged on the y-axis or the z-axis of the x, y, and z axes, the birefringence has a slightly different refractive index between the y-axis and the z-axis.
For this reason, the partially polarized light shows an interference color with respect to the original light source color when a specific light wavelength is caused by the birefringence of the film and the polarizing filter of the light.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014] Circular dichroism interference color the polarization direction of the polarizing filter of the polarization direction and the second partial polarization in the subject of Figure 1
This is a phenomenon that appears prominently at a position maintained at 45 ° with respect to the y and z axes. A partial polarization direction in the object, if the polarization direction of the second polarization filter are orthogonal or parallel, two-color interference color because representing a different interference colors appear respectively.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

In the case where the one optically anisotropic film is a multiaxially oriented film such as a biaxially oriented film with respect to the y and z planes , a multicolored film corresponding to the multiaxial orientation besides the two interference colors is used. Interference color appears. For example, when processed into a biaxially oriented film at an angle of 45 ° on the y and z planes , four interference colors appear.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Here, a description will be given in comparison with a polarizing microscope. Partially polarized light in a subject corresponds to a polarizer of the polarizing microscope. Since the intensity of the partially polarized light in the subject depends on the angle of incidence of the light , the intensity of the polarized light is often different. Since appearing when the polarization direction of the polarizing filter of the circular dichroism interference color is the polarization direction of partially polarized light 2 as described above are orthogonal or parallel, do not interference color appears in all light from the subject . Many lights may pass through this filter without changing the color tone. On the other hand, since the partially polarized light in the subject that satisfies the above conditions corresponds to a polarizer of a polarizing microscope, the film 1 in FIG. 1 has a polarization microscope sample that converts linearly polarized light into circularly polarized light with a neutral axis (45 °). Can be considered. The wave plate is a compensator for displaying a sensitive color, and utilizes an interference color of circular dichroism. The polarizing filter 2 in FIG. 1 corresponds to the analyzer of the polarizing microscope. The polarization filter of 2 is 1 if it is kept at 45 ° with respect to the y and z axes.
The film shows interference colors in optical anisotropy.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

FIG. 2 shows a special effect camera filter having a shape fixed at 45 ° to the orientation axis of the optically anisotropic film 1 and the y-axis and z-axis of the polarization direction 1 of the polarizing filter 2. It is. This filter has a rotating frame 3 rotatable in a plane perpendicular to the x-axis in FIG. 1 and is rotatable so as to maintain a polarization direction corresponding to the polarization direction in the subject. In fact, when the partial polarization in the subject appears when the two polarization filters are parallel or orthogonal to the sagittal polarization from the water surface, or when the filter is polarized vertically and horizontally in the camera
The direction rotates 90 °, and the rotating frame 3 is necessary.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

FIG. 3 shows a special effect camera filter having a rotating frame provided so that the optically anisotropic film 1 and the polarizing filter 2 can be rotated in a plane perpendicular to the x-axis in FIG. It is. This filter has a rotating frame 4 and is useful for weakening the color tone of the interference color. The rotating frame 4 has a built-in guide frame provided with a click stop every 45 ° from the y-axis and displays the guide frame. It was previously mentioned that the two polarizing filters appeared prominently in the interference color at an angle of 45 ° with respect to the y and z axes in FIG. When the polarizing filters are parallel or orthogonal, the partial polarized light in the subject does not become elliptically polarized light in one film. Therefore, no interference color appears. This state can be regarded as the same as a normal polarizing filter.
The first fill beam is when there is no neutral axis (45 °) weaken the color tone of the interference color. No interference color appears when the second polarizing filter is at an angle of 45 ° with respect to the partially polarized light in the subject. As described above, the filter of FIG. 3 is a camera filter having both a function as a special effect filter and a function as a polarizing filter.

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

There is an effective use method for performing studio photography using the above-described effects. Replace back paper on the polarizing film sheet, when the backlight shed from the back surface of the polarizing film sheets, Ru background der that corresponds to the partial polarization in the above-described object. For this reason
It can be replaced easily background color Le coater operation. Ma
Also, if you shine a polarized light on the back screen,
You can easily change the background color by filtering.

[Procedure amendment 11]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

The filter of the camera shown in FIGS. 2 and 3 can be mounted on a light for illumination. When used in a lighting fixture, a light beam that goes backwards in the x-axis in FIG. 1 illuminates the subject. As described above, the luminous flux has both the function of ordinary illumination and the function of illumination in which the reflected light generates partial polarization due to the reflection angle and exhibits an interference color according to the intensity of the polarized light. The color of the reflected light changes depending on whether the color tone of the interference color differs depending on whether the polarization direction is parallel or orthogonal, or the intensity of the partial polarization. This color tone also depends on the distribution of the spectral energy of the light source of the lighting equipment. As described above, when illuminating the subject, the intensity of polarization is determined from the reflection angle of the reflected light. Therefore, if the above-mentioned filter is attached to the adjusted illumination light, the function of illuminating the subject and the specific reflected light can be circularly reflected. This is a special effect light in which the illumination having the dichroic interference color is integrated. Moreover, the adapter of FIGS. 4 and 6 can be used.

[Procedure amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

[0028]

As described above, the present invention is mounted on a camera and used by rotating the filter itself. When the polarization direction of the polarization direction and the subject of the filter perpendicular to whether parallel by rotation, because distinguishing interference colors appear. An image by this filter is a normal image and an image having a color tone of an interference color in reflected light or the like, so that special effects can be expressed as an image. It is also possible to mount the above-mentioned filter on a light for illumination, and it is a light for a special effect which shows an interference color in partial polarization due to reflection. When the above-mentioned filter is used as eyeglasses, the reflection of natural light is weakened while having the adjusted interference color tone.

Claims (7)

[Claims] 1. A camera filter having a feature in which the optical angle of an optically anisotropic film and a polarizing filter are fixed mainly by utilizing the reflection of natural light in order to capture an interference color of circular dichroism. 2. A camera filter having a feature in which the axial angle of an optically anisotropic film and a polarizing filter can be rotated mainly by utilizing the reflection of natural light in order to capture an interference color of circular dichroism. . 3. A filter for a camera having an optically anisotropic film in the center so that the filter can be used with a wide-angle lens. 4. A filter for a camera having a feature that an optically anisotropic film can be added to the above-mentioned filter and can be mounted. 5. A filter for a camera having a feature that a polarizing filter can be added to the above-mentioned filter and can be attached. 6. A filter for a lighting fixture, wherein the filter can be attached to a lighting light. 7. The method according to claim 7, wherein the filter is used as glasses.
Filter for polarized glasses.