JPS592012B2 - photographic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photographic device, and more particularly, to a photographic device, and in particular to a band filter that is subdivided into three color bands of blue, green, and red and arranged in the pupil of a lens, and a filter that has three color bands on a surface facing the lens. The present invention relates to a photographic device for photographing or projecting a color image according to the lenticular method, comprising a lenticular lens screen extending parallel to the strip and placed on the film.

The lenticular method uses a lenticular film, aligns the direction of the color bands of the red, green, and positive three-color band filters with the axis of a semicylindrical lens (lenticular lens), and passes the filtered light through the semicylindrical lens. In this method, a three-color separated image is created by exposing the emulsion from the surface, a reversal phenomenon occurs, and the light is projected from the opposite direction using the same optical system used for photographing, thereby reproducing a color image.

Devices for taking or projecting photographs using such a lenticular method are known, in which the brightness of the lens device is determined by the size of the band filter in relation to the focal length of the lens.

In such a device, narrowing down is performed by reducing the area into a rectangular shape in a one-dimensional direction, that is, in the direction in which the band filter extends. Therefore, narrowing down, that is, reducing the exposure amount and increasing the depth of field, is performed only in one dimension. Furthermore, in this method, the minute image of the band filter that provides color information is similarly reduced in one dimension on the film, and as a result, a large resolution is required of the photosensitive layer, and the granularity becomes coarse, resulting in the band filter image being reduced. The quality will deteriorate. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate such conventional drawbacks, and to provide a photographic apparatus that allows free narrowing down without reducing the quality of a band filter image.

According to the invention, a plurality of trichroic filter units are provided, in which case the lenticular lenses are arranged such that each surface behind the individual lenticular lens is exactly filled by the image of the central trichroic filter unit. The focal length of the cyular lens screen is determined.

In this manner, according to the present invention, it is possible to increase the amount of exposure using simple optical means without significantly impairing the resolution or causing color deterioration.

Further, according to the present invention, by performing signal processing using pure optical means or other electronic means, it is possible to perform isotropic narrowing down regardless of the direction of the light beam without substantially reducing redundancy. The present invention will be described in detail below based on embodiment 011 shown in the drawings.

FIG. 1 schematically shows the principle of a photographing device based on the conventional lenticular method, and in the same figure, a three-color band filter unit 2 consisting of blue, green, and red is arranged in the pupil of the photographing lens 1. has been done.

The size of the band filter unit 2 determines the brightness (F number) of the photographing device in relation to the focal length of the lens 1. A lenticular lens screen 4 is provided on the film base surface facing the lens 1 of the film 3 having a photosensitive layer.
In this case, an image point B is formed on each lenticular lens 4a of the screen, and an image of the band film unit 2 is accurately formed on each image point. It is configured to Therefore, the images formed at each image point are band filter images 3a to 3c of three colors, respectively. In such a device, narrowing is accomplished by reducing the area of the three-color pool pool unit in the longitudinal direction to a rectangular shape.

This achieves the objective of stopping down, ie reducing exposure, but the depth of field only increases in one dimension. Furthermore, in this method, the minute images of the band filter that provide color information are similarly reduced in the one-dimensional direction on the film, so a large resolution is required for the film and graininess appears. This is because the redundancy of the filter image is reduced. FIG. 2 illustrates the principle of an apparatus for projecting the film recorded in the manner described above, the construction of which is similar to that of the photographing apparatus, but the light rays follow the opposite path.

That is, the film 3 is exposed by the light source 5 and projected by the lens 1 through the lenticular lens screen 4. In the present invention, instead of arranging a single trichromatic filter unit 2 in the pupil of the lens, a plurality of trichromatic filter units are disposed, and in this case, one (for example, the central) trichromatic filter unit among the plurality of units The optical system of the lenticular lens screen is set so that the image of the lenticular lens screen exactly fills the surface of the photosensitive layer provided by the individual lenticular lenses.

A structure for providing variable narrowing is illustrated in FIG.
The plurality of three-color band filters are composed of a central three-color band pool unit 2 (0th unit L), other three-color band filter units 2/(first left unit M), and the like.
Reference numeral 6 indicates a slide member by which the aperture is adjusted.

In the figure, the minimum diaphragm aperture N associated with the central filter unit 2 is obtained. The diaphragm can be square or rectangular, or even circular in some cases. According to FIG. 3, the central three-color band filter unit 2 is imaged onto the film 3 by the first lenticular lens 4b.

Also, the first three-color band filter unit 7 on the left is the first three-color band filter unit 7.
The +1)th lenticular lens 4c forms an image superimposed on the image of the central filter unit 2. Image formation and superimposition are similarly performed by other filter units, but these are omitted in the figure because they would be complicated. By arranging a plurality of trichromatic filter units in the pupil of the lens in this manner, it is possible to form an isotropic image that provides similar effects in all directions without substantially reducing redundancy.

As described above, the shape of the lenticular lens screen is constructed so that the image of one trichromatic filter unit among the plurality of units accurately fills the surface of the photosensitive layer provided by each lenticular lens.

If the lens is narrowed down by using a square aperture so that only the central three-color band filter unit is imaged on the photosensitive layer, in this case it becomes possible to take pictures according to the conventional lenticule method with a fixed aperture.

Also, when the aperture is opened symmetrically to the optical axis and light from the adjacent three-color band filter unit enters, each lenticular lens has an area of the lenticular lens that extends to the sides of the optical axis adjacent to the left and right. to form an image. As a result, the image of the subject formed on the photosensitive layer does not deteriorate in any way.
The amount of exposure increases due to the superposition of two images of each band filter unit per image point.

In other words, an increase in the amount of exposure corresponds to an increase in the amount of exposure when the aperture is increased. It is possible to realize an aperture value of in the simplest construction example.

Since the first aperture step in this case is very large, it is preferable to use three filter units at the minimum aperture. For example, starting from F=11 yields a preferable division.

Also, instead of a square aperture, a rectangular aperture is used, and one side of the two sides is D/? A more even division can be obtained with dimensions of .

This is based on the reason that in the case of a square aperture, the reduction in depth of field in the diagonal direction can be ignored. This gives an example of division.

In this case, eleven tricolor band filter units are used. Although technically difficult, arbitrary aperture adjustment can be performed, and a circular aperture can also be used if color errors are corrected.

For this purpose, a code is printed on the film according to the selected aperture value. This code is read through appropriate means such as optical or electronic means during projection, and signal correction is performed via the read signal so that the reproduced image is corrected to have the correct color. Since color correction can be performed using a simple color filter, color correction can be performed when printing an image optically. Matrixing is generally not necessary. Color correction can also be performed by electronic means.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams illustrating the principles of photographing and projection using the lenticular method, respectively, and FIG. 3 is an explanatory diagram showing the configuration of the apparatus of the present invention. 1...Lens, 2...3 color band filter, 3...Film, 4...Lenticular lens screen.

Claims (1)

[Claims] 1. A band filter subdivided into three color bands of blue, green, and red and arranged in the pupil of the lens, and a film extending parallel to the band of the three color band filter on the surface facing the lens. In a photographic device for photographing or projecting a color image according to the lenticular method, a plurality of three-color band filter units are arranged in the pupil of the lens, and in this case, the focal length of the lenticular lens screen is is characterized in that the distance between the filter and each lenticular lens is as follows, i.e., the surface behind each lenticular lens is exactly filled with the image of the central trichromatic filter unit. Photographic equipment. 2. The photographic device according to claim 1, wherein when the rectangular aperture is opened, the peripheral three-color band filter unit is projected by each lenticular lens onto the area of the adjacent lenticular lens. 3 Using the 11 three-color band filter unit, 11-7.
The photographic device according to claim 1 or 2, wherein the photographic device is configured to realize an aperture value of 9-4.7-3.1-2.5. 4. The photographic device according to any one of claims 1 to 3, wherein any aperture value can be adjusted and the aperture value at that time is recorded on the film as a code mark. 5. A patent claim in which a code related to different aperture values can be exposed on the film in order to record them, this code is read by a reading means when projecting the film, and color correction is automatically performed based on the read control signal. Photographic equipment according to item 4 of the scope. 6. The photographic device according to claim 5, wherein the color correction can be controlled using an optical filter. 7. The photographic apparatus according to claim 5, wherein the color correction is controlled by electronic means.