JPH03184033A - Camera with lens barrier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a camera equipped with a lens barrier.

B. Prior Art Conventionally, cameras have been known that are equipped with a lens barrier that can be opened and closed in front of the photographic lens for the purpose of protecting the photographic lens.

On the other hand, I used 35mm film (photography medium).

For example, a so-called panoramic camera is known that exposes only the central area excluding the upper and lower parts of the exposure area for one frame of a normal film, that is, an area whose length in the width direction of the film is shorter than usual. and.

By printing film taken with such a camera at a large enlargement magnification, it is possible to obtain so-called panoramic photographs that are longer in width or in length than usual.

Problems to be Solved by the C0 Invention However, as mentioned above, film shot with this type of panoramic camera has unexposed areas at the top and bottom of the screen, and these areas are completely wasted.

A technical object of the present invention is to make it possible to imprint title characters and the like at predetermined positions on the film by using the lens barrier described above.

01 Means for Solving the Problems To be explained in conjunction with FIG.
This is applied to a camera in which the subject light passes through the photographic lens 2 and is guided to the photographic medium 5 when the lens barrier 10 is in the open position.

Then, convex lenses L2b and 12c for close-up photography are provided in a part of the lens barrier 10, and when the lens barrier 10 is in the open position, a part of the subject light passes through the convex lenses 12b and 12c and is guided to the photographing lens 2. This configuration solves the above technical problem.

When the E0 effect lens barrier 10 is in the open position, a portion of the subject light passes through the convex lenses 12b, 12c and the photographic lens 2 in order and is guided to the photographic medium 5. Therefore, when the above-mentioned panoramic camera is used, it is possible to imprint title characters or a very close subject on a part of the film that has not been exposed in the past.

It should be noted that in the above-mentioned sections and section E, which describe the present invention in detail, figures of embodiments are used in order to make the present invention easier to understand, but the present invention is not limited to the embodiments.

F. Example An embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a camera according to the present invention, in which (a) is a front view;
(b) is a sectional view taken along the line bb of (a).

In FIG. 1(b), subject light entering from an opening 1 on the front surface of the camera passes through a photographing lens 2, and then is guided to a film 5 via a shutter 3 and an aperture 4. 6 is an aperture, the lower end 6a of which is closer to the center of the film 5 than the upper end 6b.

A lens barrier 10 consisting of upper and lower barriers 11 and 12 is provided inside the opening 1, and each barrier 11 and 12 has an arm portion 11a extending downward.

12a (FIG. 1(a)) are provided respectively. Rack gears are formed on the inside of the arm 11a and on the outside of the arm 12a, and these rack gears are connected to the arm 11.
It meshes with a pinion gear 21 fixed between a and 12a. Further, an arm portion 22a of a slide lever 22 provided on the front surface of the camera body is engaged with the lower portion of the pinion gear 21.

This slide lever 22 can be slid between the position shown by the solid line and the position shown by the two-dot chain line. In the solid line position, the upper and lower barriers 11 and 12 are open to each other as shown by the solid line in FIG. 1(b). In this state, when the lever 22 is slid toward the position indicated by the two-dot chain line, the gear 21 rotates due to the movement of the arm 22a, so the gear 21 and each arm 11a, 12a
Due to the engagement with the rack gear, the upper and lower barriers 11 and 12 are lowered and raised, respectively, and when the lever 22 reaches the position indicated by the two-dot chain line, the barriers 11 and 12 close together in front of the photographing lens 2.

A transparent holder portion 12a as shown in FIG. 2 is integrally formed at the upper end of the lower barrier 12.
a has a pair of convex lenses 12b and 12c for close-up photography that protrude inside the camera, and a memo holder 12d formed at the front of the convex lenses 12b and 12c. Memo holder↓2
A translucent milky white plate (memo member) 30 is inserted into d, and characters 41 and 42 as shown can be written on this milky white plate 30, for example.

Next, the operation of the embodiment will be explained.

When the lens barrier 10 is in the open position as shown by the solid line in FIG. 1(b), the milky white plate 3 with letters 41 and 42
0 into the memo holder 12d. When a release button (not shown) is pressed in this state, the diaphragm 4 is driven to a predetermined aperture value, and then the shutter 3 opens, and the subject light is transferred to the photographic lens 2. Shutter 3. The light is guided to the film 5 through the aperture 4, and a subject image 51 is exposed onto the film 5 as shown in FIG.

Here, a part of the luminous flux of the object light incident from below the opening 1 is guided to the milky white board 30 inserted into the memo holder 12d of the lower barrier 12, and the characters 41. The silhouette of 42 is the convex lens 12b
, 12c and enters the photographing lens 2. Since the memo holder 12d is located within the front focal length of the convex lenses 12b and 12c, the silhouettes of the characters 41 and 42 are as follows.
A long-distance virtual image is formed by the convex lenses 12b and 12c, respectively, and the image is formed on the upper part of the film 5 as shown in FIG.

According to the above, since the upper and lower parts of the subject light incident on the photographing lens 2 are cut by the upper and lower barriers 11 and 12, the subject image exposed by the subject light that does not pass through the convex lenses 12b and 12c is The length of is shorter than usual, which makes it possible to obtain the above-mentioned panoramic photograph.

And on top of it is a milky white plate 30. convex lens 12b,
The characters 41 and 42 are imprinted by the light beam that has passed through the lens 12c and the photographing lens 2 in this order. Therefore, film 5
The upper part, which has not been exposed in the past, can be effectively utilized. Here, the boundary between the subject image and the letters 41.42 is not clear and appears blurred, but if the focal length of the photographing lens 2 is short and the maximum aperture value is large (dark), the blurring will be less. .

FIG. 4 shows a modified example, in which the upper and lower ends of the aperture 60 are equidistant from the optical axis of the photographic lens 2 so that photography can be performed in a normal-sized exposure area. Also,
The lens barrier 10 is in the above-mentioned closed position and in FIG. 4(a).
It can be held in the first open position shown in FIG. 4(b) and in the second open position shown in FIG. 4(b).

In the state shown in FIG. 4(a), the subject light incident from above is blocked by the upper barrier 11, and the subject light incident from below is blocked by the memo holder 12d inserted into the memo holder 12d of the lower barrier 12, as described above. The light then passes through the lenses 12b and 12c in order and enters the photographing lens 26.Therefore, in this case as well, a so-called panoramic photograph can be obtained and title characters can be imprinted.

Further, in the state shown in FIG. 4(b), since the lens barrier 10 is completely opened, the exposure area on the film 5 becomes one normal size, and no title characters are imprinted.

In the above description, the memo holder 12d was provided to imprint the title characters, but if the memo holder 12d were not provided, for example, a predetermined area of the normal exposure area on the film would be filled with light beams that passed only through the photographic lens. It is possible to simultaneously expose a subject image (for example, a distant view) onto the film, and a subject image (a very close subject) produced by the light flux that has passed through the convex lens and the photographic lens in other areas on the film at the same time, making it possible to obtain special photographs. It becomes possible.

Furthermore, in the above example, a convex lens is provided on the lower barrier 12, but the convex lens may be provided on the upper barrier 11. This is the lower part (upper part in printing) of area 51.

Furthermore, if convex lenses are provided on both the upper and lower barriers, it is possible to imprint title characters and close objects in the upper and lower portions of the exposure area 51.

Furthermore, a lens barrier that opens and closes not in the vertical direction but in the horizontal direction may also be used, and in this case, title characters and nearby objects will be imprinted on the left and right portions of the exposure area.

Further, the number of convex lenses 12b and 12c is not limited to the embodiment. Further, although the description has been made regarding a normal camera that exposes film to light, the present invention can also be applied to an electronic still camera that records information about a subject image on a floppy disk as a photographic medium.

G1 Effects of the Invention According to the present invention, a convex lens for close-up photography is provided in a part of the lens barrier, and the beak 5 is formed so that a part of the subject light passes through this convex lens and is guided to the photographing lens. With cameras, title characters and nearby objects can be captured in areas that were previously not exposed, allowing for effective use of film.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, and FIG.
) is a front view of the camera according to the present invention, FIG. 1(b) is a sectional view taken along line bb--b, FIG. 2 is a perspective view showing details of the holder, and FIG. 3 is a view showing the exposure state of the film. , FIG. 4 is a sectional view of a camera showing a modified example. 2: Photographic lens 5: Film 10: Lens barrier 11: Upper barrier 12: Lower barrier 12a: Holder parts 12b, 12c: Convex lens 12d: Memo holder

Claims (1)

[Scope of Claims] 1) A camera comprising a lens barrier that opens and closes in front of a photographic lens, and in which subject light passes through the photographic lens and is guided to a photographic medium when the lens barrier is in an open position, comprising: A convex lens for close-up photography is provided in a part of the lens barrier, and when the lens barrier is in an open position, a part of the subject light passes through the convex lens and is guided to the photographing lens. A camera with a lens barrier. 2) The camera with a lens barrier according to claim 1, further comprising a memo holder into which a transparent or translucent memo member is inserted in front of the convex lens.