JPH11242257A - Film unit with lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily execute a variety of filter photographing by sliding a filter plate provided with a filter in a right-and-left direction or an up-and-down direction and attaching/detaching it at the front position of a photographing lens. SOLUTION: A front cover 11 is provided with holding parts 11a and 11b having long grooves in the right-and-left direction on its front surface, and the filter plate 13 is inserted in the long grooves of the holding parts 11a and 11b from a lateral direction so as to be slid in the right-and-left direction. The filter plate 13 is formed of transparent resin and provided with an aperture part 13a consisting of a through-hole, a soft focus filter 13b and a special effect filter 13c. In such a case, the aperture part 13a is positioned in front of the photographing lens. Therefore, by sliding the filter plate 13 leftward by one step in ordinary photographing, the filter 13b is positioned in front of the photographing lens and soft focus photographing can be possible, and by sliding the filter plate 13 leftward by one step further, the filter 13c is positioned in front of the photographing lens and special effect photographing is available.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens capable of photographing with a filter, and a material of a sector of a shutter in the film unit with a lens.

[0002]

2. Description of the Related Art Since a film unit with a lens is not provided with a filter screw, it is not possible to mount a commercially available circular filter and perform filter photography. However, there is a demand for performing filter photographing, and a filter that is attached to the front of a film unit with a lens using rubber is commercially available as an accessory.

[0003] Further, the sector of the shutter in a conventional film unit with a lens is formed of a resin such as polystyrene or a metal plate such as phosphor bronze.

[0004]

Although it is not impossible to provide a filter screw on a film unit with a lens, it is troublesome for a user to select and purchase an appropriate filter from various types of commercially available filters. ,
Even if the camera is packaged and sold at the same time as the lens-fitted film unit, there is an annoyance that the user has to remove the filter and carry it when not performing the filter shooting. Further, there is a problem that the optical positioning of the filter attached by rubber is uncertain.

In view of such a problem, the first object of the present invention is to propose a lens-equipped film unit in which a filter can be easily inserted and removed depending on the presence or absence of filter photographing.
Subject.

When the user presses the release button during photographing, the sector is hit by a predetermined member of the shutter and rotates, and the sector is retracted from the opening through which the subject light passes to the film and the opening is opened. Thereafter, the sector is restored by the force of the spring, closes the opening again, and stops by contacting the predetermined stopper. At this time, if the sector is light, the sector is rebounded without stopping after coming into contact with the stopper, and the opening is slightly opened again. This phenomenon is called bounding, and the film is exposed twice. When the bounce occurs, the image becomes blurred and double, resulting in a very unsightly photograph.

When the sector is formed of resin, the cost is relatively low, which is suitable for a film unit with a lens which aims at low cost.

In order to prevent this bouncing, for example, measures have been taken to make the end of the sector bite into the side surface of the stopper. However, taking into account the fact that the sector is light, the shutter speed tends to be unstable. Met.

When the sector is made of metal, no bounce occurs because it is heavy. However, the cost of the sector is high, and it is not suitable for a film unit with a lens.

The present invention has been made in view of such a problem, and proposes a lens-equipped film unit having a certain weight and a sector in which no bouncing occurs, despite being molded with an inexpensive resin. This is a second problem to be solved by the invention.

[0011]

Means for Solving the Problems The first object is solved by any of the following means.

A film unit with a lens, characterized in that a filter plate provided with a filter is slid in the left-right direction or the up-down direction to be inserted and removed at a position in front of the taking lens.

A filter for obtaining a filter effect only for a subject located at a predetermined central portion in the range of the photographic field of view is mounted in front of the photographic lens, and an area corresponding to the predetermined central portion in the finder and another area are provided. A film unit with a lens, wherein the area is distinguished from the area by an objective lens.

[0014] The second object is solved by a film unit with a lens, characterized in that the sector of the shutter unit is formed of a high specific gravity resin into which metal powder is kneaded.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An embodiment of a film unit with a lens which solves the first problem will be described with reference to FIGS.

FIG. 1 is a perspective view of a film unit with a lens. The inside of the lens-fitted film unit is covered by a front cover 11 and a rear cover 12. A holding portion 1 having a long groove in the left-right direction on the front surface of the front cover 11.
1a and 11b are provided, and the filter plate 13 is inserted into the long groove of the holding portions 11a and 11b from the lateral direction, and is configured to be slidable in the left-right direction. The filter plate 13 is formed of a transparent resin, and has an opening 13a formed of a penetrated hole, a soft focus filter 13b for roughening the surface to perform soft focus photographing, and a prism for projecting the same subject into five images. An effect filter 13c is provided. These are provided with a click stop (not shown) so that when the filter plate 13 is slid, the optical axis coincides with the internal photographing lens.
Optical positioning can be performed accurately.

In FIG. 1, since the opening 13a is located in front of the photographing lens, normal photographing is performed. However, when the filter plate 13 is slid one step to the left, soft photographing is performed in front of the photographing lens. When the focus filter 13b is located and soft focus shooting is possible, and when the focus filter 13b is further slid to the left by another stage, the special effect filter 13
The special effect photographing becomes possible when c is positioned.

It should be noted that a transparent plate whose front and back surfaces are parallel may be used instead of the opening 13a.

The filters are not limited to the soft focus filters and the special effect filters which appear in five images, but are color filters for correcting the color to a more natural color tone or an unnatural color tone, or three or six filters. Any filter may be used, such as a special effect filter that appears in the image of the above, a cylindrical lens that makes a person thinner or thicker, and the like.

Instead of providing two types of filters on the filter plate 13, one type or three or more types may be provided.

The filter plate 13 is provided with the holding portions 11a and 1a.
1b, and may be configured so that the user cannot easily remove the filter plate 13;
A plurality of holding plates having different filters may be packaged simultaneously or sold separately, and the filter plate may be configured to be insertable and removable so that the user can replace it with an arbitrary filter plate.

Reference numeral 14 denotes a finder entrance window, 15 denotes a release button, 16 denotes a winding knob, and 17 denotes an indexer window.

Next, the shape of the filter plate will be described.

FIG. 2 is a longitudinal sectional view of the filter plate and the holding portion and the like. The filter plate 131 has a filter surface 131b composed of a soft focus filter, for example. 111b
Are inserted and held in the long grooves 111c and 111d provided in the first and second positions. Here, the filter surface 131b and the holding surface 131d
Are formed on the same plane.

It is desirable that the distance between the back surface of the filter plate 131 and the front surface of the taking lens L is within 5 mm.

However, without being limited to this, as shown in FIG.
Filter surface 132b of filter plate 132 and holding surface 132
d may be formed on a different plane.

Further, as shown in FIG.
The filter surface 133b of the third
b and the holding surface 133d may be formed on different planes.

Further, as shown in FIG. 5, the filter plate 134 is curved in design, and the holding portion 1 of the front cover 14 is formed.
14a, 114b, filter surface 134b, and holding surface 1
34d may be curved. Note that the filter surface may be flat and only the holding surface may be curved, or the filter surface may be curved and only the holding surface may be flat. In the above description, the filter plate is slid in the left and right direction. , May be configured to slide vertically.

Further, in the above description, the holding portion for holding the filter plate is formed on the front cover. However, the holding portion may be formed separately from the front cover, and may be detachably attached to the film unit with the lens as needed. Good.

Next, the finder in the film unit with lens provided with the filter will be described.

The filters include, for example, a filter that directly captures the central portion and captures the peripheral portion as a soft-focus image, a filter that captures the central portion as it is and renders the peripheral portion flowing, and a special filter that displays the central portion as a number of images. There are effect filters and the like, which focus on a subject located at the center as a main subject and obtain a special shooting effect. Therefore, it is desirable that the area of the subject located at the center of the finder can be determined.

FIG. 6 is a perspective view of an inverted Galilean finder, which is composed of an objective lens 21 and an eyepiece 22. The objective lens 21 is a plano-concave lens, the plane part is directed to the subject side, the eyepiece 22 is a plano-convex lens,
The flat part faces the photographer. In the concave surface of the objective lens 21, an area 21a corresponding to the central portion where the special photographing effect by the filter is obtained remains transparent, but the other concave surfaces are colored. As for the coloring color,
Black may be used as long as it is a dedicated film unit with a lens that always has a filter for obtaining a special photographing effect as described above. However, if it is a combined film unit with a lens that enables general photographing without using a filter, it is not very dark. Color is preferred.

Further, as shown in the cross-sectional view of the objective lens in FIG. 7, the concave surface of the objective lens 26 is formed by two Fresnel lenses, and a region corresponding to a central portion where a photographing effect by the finder is obtained is defined by a Fresnel surface 26a. If the other area is the Fresnel surface 26b, the central portion where the photographing effect is obtained due to the step of the Fresnel becomes clear.

[Second Embodiment] First, an embodiment relating to opening and closing of a sector used in a film unit with a lens will be described with reference to FIGS. 8 shows a state in which the shutter is charged, FIG. 9 shows a state in which the shutter is operated and the sector opens the opening, and FIG. 10 shows a state in which the operation of the shutter is completed and the sector closes the opening. FIGS. 11A and 11B are views in which a bounce has occurred and the sector has opened a part of the opening again.

In each of the figures, the sector 31 rotates about a support shaft 32 and is urged counterclockwise by a tension spring 33. Therefore, when stationary, as shown in FIGS. 8 and 10, the terminal 31a of the sector 31 is in contact with the stopper 34, and the sector 31 closes the opening 36 that allows the subject light to pass through the film.

When the shutter is being charged, the charge lever 35 moves leftward from the state shown in FIG. At this time, the hole 3 of the sector 31 fitted with the support shaft 32
Since 1c is formed in a long hole, the charge lever 34
Pushes the leading end 31b and moves the sector 31 slightly downward, but does not open the opening 36 at all.

After the shutter is charged as shown in FIG. 8, when the user presses a release button (not shown), the charge lever 35 is quickly moved rightward by a spring (not shown), and the leading end 31b of the sector 31 is moved. The sector 31 is turned clockwise as shown in FIG. 9 to open the opening 36 as shown in FIG. The charge lever 35 moves the sector 31 further clockwise to move rightward. Sector 31
Is rotated by a predetermined angle by inertia force against the urging force of the tension spring 33, then stopped, and then
10 to close the opening 36 as shown in FIG.

The opening and closing operation of the sector in the normal shutter is as described above. However, as described in "Problems to be Solved by the Invention", if the sector is light, a bounce occurs.

That is, the sector is closed and the terminal 31a is closed.
11 does not stop at that position when it comes into contact with the stopper 34, and the sector 31 is rebounded by the stopper 34 as shown in FIG. The part 36 is opened again.

In order to solve this problem, in the present invention, a high specific gravity resin into which metal powder is kneaded is used as the material of the sector. As the metal powder, an iron-based material is preferable in terms of weight and cost, and as the resin into which the metal powder is kneaded, polystyrene is preferable. And the specific gravity is 4.5-
5.0 is preferred.

By using such a high specific gravity resin, a bounce is eliminated and a shutter having a stable shutter speed can be obtained.

Since the specific gravity of the high specific gravity resin can be easily changed depending on the material and the mixing ratio of the metal to be kneaded, it is possible to easily follow a change in the shutter speed, and design changes are made to the lens-fitted film unit for each application. It can be easily handled without doing so.

[0043]

According to the film unit with a lens according to the first, third to seventh aspects, various kinds of filter photographing can be easily performed.

According to the film unit with the lens according to the second aspect, it is possible to easily switch between film shooting and normal shooting.

According to the film unit with the lens according to the eighth aspect, the filter plate is not dropped or lost.

According to the film unit with the lens according to the ninth aspect, various types of filter photographing can be performed according to the user's preference.

According to the film unit with the lens according to the tenth aspect, when filter photography is not performed, the thickness of the film unit with the lens is reduced and portability is improved.

According to the film unit with the lens according to the present invention, when a filter capable of obtaining a special photographing effect is used, the photographing area can be confirmed by the finder.

According to the film unit with the lens according to the present invention, it is possible to obtain a shutter which is inexpensive, has no bounce, and has a stable shutter speed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a film unit with a lens.

FIG. 2 is a longitudinal sectional view of a filter plate, a holding unit, and the like.

FIG. 3 is a longitudinal sectional view of a filter plate, a holding portion, and the like.

FIG. 4 is a longitudinal sectional view of a filter plate, a holding portion, and the like.

FIG. 5 is a longitudinal sectional view of a filter plate, a holding unit, and the like.

FIG. 6 is a perspective view of an inverted Galilean finder.

FIG. 7 is a sectional view of an objective lens.

FIG. 8 is a diagram illustrating a state where a shutter is charged.

FIG. 9 is a view showing a state in which a shutter is operated and a sector opens an opening.

FIG. 10 is a view showing a state in which the operation of the shutter has been completed and the sector has closed the opening.

FIG. 11 is a diagram in which a bounce has occurred and a sector has opened a part of the opening again.

[Explanation of symbols]

 11 Front cover 11a, 11b, 111a, 111b Holding part 13, 131, 132, 133, 134 Filter plate 13a Opening 21, 26 Objective lens 31 Sector 31a Terminal 31b Tip 32 Spindle 33 Tension spring 34 Stopper 35 Charge lever 36 opening

Claims (16)

[Claims] 1. A film unit with a lens, wherein a filter plate provided with a filter is slid in a horizontal direction or a vertical direction to be inserted and removed at a position in front of a photographing lens. 2. The lens-equipped film unit according to claim 1, wherein the filter plate is provided with an opening through which subject light passes or a transparent portion whose front and back surfaces are parallel to each other. 3. The film unit with a lens according to claim 1, wherein two or more types of filters are provided on the filter plate. 4. The filter according to claim 1, wherein a filter surface forming the filter and a holding surface holding the filter plate around the filter surface are formed on the same plane.
A film unit with a lens according to item. 5. The filter according to claim 1, wherein a filter surface forming the filter and a holding surface holding the filter plate around the filter are formed on different planes. Film unit with lens. 6. The lens-equipped film unit according to claim 1, wherein a holding surface for holding the filter plate at the periphery is curved. 7. The film unit with a lens according to claim 6, wherein a filter surface forming the filter is curved. 8. The film unit with a lens according to claim 1, wherein the filter plate is configured so as not to be detached from a holding portion for guiding and holding the filter plate. . 9. The lens-equipped film unit according to claim 1, wherein the filter plate can be inserted into and removed from a holding portion for guiding and holding the filter plate. 10. The lens-fitted film unit according to claim 1, wherein the holding portion for guiding and holding the filter plate is detachable from the lens-fitted film unit. 11. A filter for obtaining a filter effect only for a subject located at a predetermined central portion in a range of a photographing angle of view is mounted in front of a photographing lens, and an area corresponding to the predetermined central portion in a finder is provided. A film unit with a lens, characterized in that it is distinguished from other areas by an objective lens. 12. The film unit with a lens according to claim 11, wherein the other area of the objective lens is colored. 13. The object lens according to claim 11, wherein the objective lens is formed of two Fresnel lenses, and a region corresponding to the predetermined central portion and a different region have different Fresnel surfaces. Film unit with lens. 14. A film unit with a lens, wherein a sector of the shutter unit is formed of a high specific gravity resin into which metal powder is kneaded. 15. The film unit with a lens according to claim 14, wherein the metal powder is made of an iron-based metal. 16. The film unit with a lens according to claim 14, wherein the resin into which the metal powder is kneaded is polystyrene.