JP3205960U - Polarizing filter sheet for small phones such as smart phones and web cameras - Google Patents

Abstract

Provided is a polarizing filter sheet that can be easily attached to a vehicle-mounted camera such as a smart phone, a mobile phone, a WEB camera, a drive recorder, and the like, and that prevents good shooting from being interrupted or reflected by reflected light at a low cost. A polarizing film in which the length or shape in the vertical direction and the horizontal direction is changed so that the transmission axis of the polarizing plate can be easily grasped visually, and the direction of the transmission axis is parallel to the vertical direction or the horizontal direction. A pressure-sensitive adhesive sheet is affixed to one side of the camera via an adhesive layer and fixed to the surface of the camera. [Selection] Figure 1

Description

The present invention relates to a polarizing filter for a small camera such as a camera attached to a mobile phone or a smart phone, or a web camera. More specifically, the present invention relates to a polarizing filter that can be easily attached to and detached from a small camera and can be provided as a polarizing filter with excellent operability and low cost.

A polarizing filter refers to a filter that prevents reflected light generated in or around a subject to be photographed from entering a camera lens. For a conventional camera application such as a single-lens reflex camera, for example, a structure that can be attached to the lens by attaching a metal fitting or the like that can be attached to the lens unit to the polarizing plate so as to be detachable from the lens.

However, in a camera attached to a mobile phone or a smart phone, the lens is embedded in the plane, and it is impossible to fix the lens with the above-described metal fittings. For this reason, products having a structure in which a polarizing filter having the same structure as described above is attached to a smart phone or the like with a clamp structure or the like are currently on the market. These products can sufficiently prevent reflected light and reflection.
However, since these products include a clamping structure and the like as a mechanism for detachment, the structure is considerably bulky. For this reason, it deviates from the structure of the mobile phone / smartphone, which is originally convenient for carrying, and the original convenience is lost. The price is also expensive. Therefore, at present, there is a high demand for prevention of reflected light and prevention of reflection regardless of whether it is outdoors or indoors, but the use of polarizing filters is limited. For small cameras such as Web cameras, the use of polarizing filters has not progressed for the same reason.

Patent Document 1 relates to a mechanism for attaching and detaching a turntable having a plurality of attachment holders for attaching optical components to a lens surface of an electronic camera using a magnet. Non-Patent Document 1 has a detailed description of a phenomenon related to the device.

JP2004-309988

E. Hecht, Optics, 2nd edition, p298 (1989)

The present invention improves the situation as described above, and does not lose the convenience of carrying a mobile phone or smart phone, and provides sufficient anti-reflection and reflected light prevention functions for small cameras such as mobile phones, smart phones and web cameras. The purpose is to provide.

The present invention provides a polarizing filter that can be easily attached to and detached from a small camera such as a smart phone or a web camera.

The principle of the polarizing filter is that when light is reflected on the object surface and the angle of reflection perpendicular to the object surface is 0 degree, only the polarization component that vibrates parallel to the object surface is reflected near 60 degrees. Light that vibrates vertically is absorbed. This angle around 60 degrees is called a bruster angle.

Since reflected light has the above characteristics, in order to prevent reflected light (reflection), only polarized light that vibrates perpendicularly to the surface is cut off from light that vibrates parallel to the surface of the target object. It is effective to use for photography. For this purpose, a polarizing plate having a transmission axis perpendicular to the plane may be attached to the camera. In some cases, the effect of photography can be enhanced by conspicuous reflection from the surface. In that case, it is effective to stick the transmission axis direction parallel to the corresponding surface.

Here, polarized light refers to light that vibrates only in one direction. A polarizing plate is an optical film that transmits only light that vibrates in one direction. The vibration direction of polarized light that can be transmitted through the polarizing plate is called a transmission axis. The direction perpendicular to it and absorbing polarized light oscillating in that direction is called the absorption axis.

From such a principle, a polarizing filter is used to prevent reflection. A conventional polarizing filter of a camera such as a single-lens reflex camera is disposed in the front part of the lens and the polarization axis is rotatable. For this reason, the polarizing plate is fixed in front of the lens with a metal circular frame so that the polarizing plate can be rotated.

For small camera applications such as smart phones and web cameras, a structure is also adopted in which the polarizing plate is fixed with a frame such as a latch and fixed to a small camera such as a smart phone or web camera. The original portability of small cameras such as cameras was significantly impaired.

The present inventor examined a method for realizing an anti-reflection function at a low cost without impairing the portable convenience of a small camera such as a smart phone or a web camera, and these objects can be achieved by the method of the present invention. I found out. The present invention is a sheet made of a polarizing plate having a shape in which the transmission axis direction and the absorption axis direction of the polarizing plate are different, and the transmission axis direction and the absorption axis are visually recognizable, with an adhesive layer on one side The present invention relates to an affixed polarizing film sheet.

The present invention makes it possible to attach a polarizing plate to a small camera such as a smart phone or a web camera easily and inexpensively. According to the present invention, it is possible to prevent reflection at a low cost without impairing the portability even for a small camera such as a smart phone or a web camera.

It is a front view which shows an example when the film of this invention was attached to the smart phone. It is a front view which shows an example of a structure of the film of this invention. It is a side view which shows an example of a structure of the film of this invention. It is a photograph of a landscape taken without the film of the present invention. This is a landscape photograph taken with the film of the present invention so that the transmission axis of the polarizing plate is in the vertical direction. It is a photograph of a landscape taken with the film of the present invention so that the transmission axis of the polarizing plate is horizontal.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an example of an application example of the present invention, and is a front view when the polarizing filter sheet of the present invention is applied to a smart phone camera. FIG. 2 is a front view of an example of the polarizing filter of the present invention. FIG. 3 is a side view thereof.

The present invention relates to a polarizing filter for a small camera such as a smart phone or a web camera. More specifically, the present invention can be easily attached to and detached from a small camera, and provides a polarizing filter with excellent operability and low cost. The present invention relates to a polarizing filter that can be used.

The polarizing filter of the present invention has a shape that allows the direction of the transmission axis to be easily discriminated from its shape, such as a rectangle, an ellipse, and the like, by using an adhesive member that can be attached to and detached from one surface of the film. It is affixed.

In many cases, a polarizing filter usually shoots with the transmission axis of a polarizing plate fixed in a direction parallel to the plane of the subject. Depending on the angle of the plane, there may be a horizontal direction, a vertical direction, or an intermediate angle. For example, when the water surface is taken, the transmission axis is preferably in the vertical direction, but in order to prevent the reflection of the window, the horizontal direction is preferable. For this reason, the polarizing plates of commercially available polarizing filters are rotated.

In the present invention, it is easy to set the optimum angle by facilitating the desorption. Therefore, the adhesive film which can remove | desorb a polarizing plate is being fixed through the contact bonding layer. For this reason, since the film can be detached, it is possible to adjust the direction of the transmission axis of the polarizing plate in an optimum direction depending on the relationship between the subject and the light direction.

Depending on the shooting environment, it is often better to remove the polarizing film, in which case it can be removed from the camera and affixed to other locations on the mobile phone or smartphone.

As described above, the polarizing film is often used to prevent reflection by cutting off reflected light by photographing with the transmission axis parallel to the plane of the subject. For this reason, the said polarizing film filter is good in the shape which can understand the direction of a transmission axis easily. Therefore, an ellipse or a rectangle is preferable instead of a circle or a square. Even if it is not such a shape, it is sufficient that the direction of the transmission axis can be visually observed by some shape.

When the polarizing filter is soiled by touching a part of the camera lens that is over the lens, a phenomenon such as a blurred image occurs. For this reason, it is preferable to make it the shape which the part does not touch with a finger as much as possible at the time of attachment or detachment.

Examples of the present invention will be described below, but the scope of the present invention is not limited to these examples.

[Example 1]
The polarizing plate is cut into the shape shown in FIG. The direction of reference numeral 7 in FIG. 2 is the direction of the transmission axis of polarized light of the polarizing plate. The adhesive sheet (Three M Japan Co., Ltd.) having a thickness of 0.25 mm is passed through a transparent double-sided tape (T284 (product name) manufactured by Nitoms Co., Ltd.) having a width of 0.5 mm and a thickness of 0.1 mm as indicated by reference numeral 6 in the polarizing plate in FIG. KRS-15 (trade name)) was placed. FIG. 3 shows a side view.

The adhesive sheet can be easily adhered to the surface of a small camera such as a smart phone or a web camera by its adhesive force. This adhesive force is sufficient for daily life. If it is attached to the camera part as shown in Fig. 1 or attached to a part of the smartphone case, it will be peeled off by normal use. It will never be.

It is possible to recognize the direction of the polarization axis by making one side longer than the other side as in the above structure or changing the vertical and horizontal shapes. The reflected light has many polarization components that vibrate in a direction perpendicular to the traveling direction and parallel to the plane on which the light is reflected. Since the sheet of the present invention prevents reflected light from the subject or an object around the subject from entering the camera lens, it is usually effective that the direction of the polarization axis is horizontal. .

However, for example, when taking an indoor landscape from the outside through the window glass, it is effective to cut the reflected light from the window glass, so that it is effective to set the transmission axis of polarized light in the vertical direction. Depending on the angle of the subject, directions other than horizontal and vertical may be effective.

Since the film of the present invention can be easily attached and detached, the vibration direction of polarized light to be transmitted can be easily selected. Moreover, since it is not bulky like the product of the same purpose fixed to a smart phone with a clamp etc. until now, it can be used as a normal smart phone with a film attached. In addition, it is possible to manufacture at a low cost for a simultaneous product fixed to a smart phone or the like with a clamp or the like.

FIG. 5 is a photograph of the same place taken at the same time as FIG. 4 of the comparative example. You can observe the state of the water well.

[Example 2]
A polarizing filter is usually used to absorb reflected light and remove the influence of reflected light from an image. For example, it may be preferable to capture a reflected image such as “Inverse Fuji” more clearly. In that case, it is only necessary to attach a film so that the vibration direction of the polarized light of the reflected light is parallel to the direction of the transmission axis of the polarizing filter. FIG. 6 is a photograph of the same scenery at the same time as in FIGS. 4 and 5, with the transmission axis of polarized light of the film of the present invention being horizontal. Only the scenery of the sky reflected on the water surface is observed without seeing the underwater situation.

[Comparative example]
FIG. 4 is a photograph of the same scene taken without attaching a film at the same time as described in Examples 1 and 2. The sky and the water reflected on the surface of the water are shown at the same time.

It can be used for cameras such as smart phones, mobile phones, Web cameras, and in-vehicle monitor cameras. These cameras are particularly effective when it is desired to prevent reflection and to prevent reflected light. Conversely, it is also effective when it is desired to particularly emphasize surface reflection.

1. Smartphone 2. 2. Camera part of smartphone 3. Polarizing film 4. Adhesive layer and adhesive layer Polarizing film6. 6. Adhesive layer and adhesive layer 7. Transmission axis direction of polarizing film Polarizing film9. Adhesive layer 10. Adhesive layer
11. Direction of transmission axis
12. Direction of transmission axis

Claims (1)

The polarizing plate has a transmission axis direction and an absorption axis direction having different lengths or shapes, and is a sheet made of a polarizing plate having a shape in which the transmission axis direction and the absorption axis direction can be visually recognized, and an adhesive layer is provided on one surface. A polarizing filter sheet attached via an adhesive layer.

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