JPS61138931A - Camera incorporating telephoto lens - Google Patents

Abstract

PURPOSE:To secure a sufficiently long optical path with small-sized constitution itself by securing a three-dimensional optical path when a movable lens barrel which is fitted above a side part of a camera body and has extremely large telephoto effect is pulled and raised to a photographic position. CONSTITUTION:The movable lens barrel 10 is pulled and raised to project from the side part of the camera body during photography as shown by an alternate long and two short dashes line. Consequently, the projection 10a of the movable lens barrel 10 moved back from under the shoulder part 14a of a release shaft 14 to allow ultra-telephotography. Then, an image of a subject becomes a regular erect image through four mirrors 12, 16, 17 and 18. The movable lens barrel 10 is rotated to a stand-by position shown by a dotted line after the photography. Consequently, the projection 10a of the movable lens barrel 10 comes to under the shoulder part 14a of the release shaft 14, which is then inhibited from being pressed, so that a camera mechanism such as a shutter can not be operated. Thus, the sufficiently long optical path is secured with the small-sized constitution itself.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera with a built-in telephoto lens that has a very large telephoto effect.

[Prior art]

Many full-size compact cameras that use 35mm roll film have an I lens with a focal length of about 35mm, but with this lens you have to get very close to the subject to achieve this. cannot be photographed. In order to solve this problem, a camera incorporating a telephoto lens with a long focal length has been proposed (Japanese Patent Application Laid-Open No. 143013/1983). This camera with a built-in telephoto lens has a telephoto lens placed in a position shifted laterally from the front of the exposure window, and the photographing light that has passed through the telephoto lens is incident on a first mirror placed behind it. The photographing light is reflected in the lateral direction of the camera body and is made to enter a second mirror placed in front of the exposure position, and is made to enter the film via this second mirror. However, this camera uses a telephoto lens with a very long focal length, such as 3
When using a lens with a focal length of 0.00 mm (which has a telephoto effect approximately 8 times more effective than a lens with a focal length of 35 mm), the hack focus is quite long, so the distance between the exposure position and the second mirror must be adjusted accordingly. It is necessary to provide a large distance between the second mirror and the first mirror, resulting in a problem in that the lateral length and thickness of the camera body become considerably large.

[Purpose of the invention]

An object of the present invention is to provide a camera with a built-in telephoto lens that can be equipped with a telephoto lens with a very long focal length while keeping the camera body small and thin, and is convenient to carry and store. be.

[Features of the invention]

In order to achieve the above object, the present invention arranges a plurality of mirrors within the camera body to ensure a three-dimensional optical path, and also provides a telephoto lens with a very large telephoto effect above the 111 part of the camera body. (hereinafter referred to as super telephoto lens)
The movable lens barrel is attached with a winding mechanism, and when the movable lens barrel is moved from the retracted position aligned with the camera body to the shooting position perpendicular to the camera body, super-telephoto shooting can be performed. .

Embodiments of the present invention will be described in detail below with reference to the drawings.

〔Example〕

In FIG. 1, which shows an outline of the present invention, when a winding lever 1 is operated, a shaft cylinder 2 fixed to the winding lever 1 rotates. A gear 3 is fixed to this shaft cylinder 2, and rotation of the winding lever 1 is transmitted to a gear 4 via the gear 3. The rotation of the gear 4 is controlled by the take-up spool 5 through a well-known gear train.
The signal is transmitted to gear 6, which is fixed to . This take-up spool 5
When it rotates in the direction of the arrow in conjunction with the winding lever 1, the photographed film 7 is wound around its outer periphery, and
One frame of unexposed film 7 wound in a roll inside cartridge 8 is pulled out.

The take-up spool 5 is placed in a film take-up chamber, and the cartridge 8 is loaded in a cartridge storage chamber. A well-known exposure window is provided between the film winding chamber and the patrol storage chamber, and light passing through the window is incident on the film 7 at the exposure position. This film 7 has a width of 35 mm, and a full size screen 7a of 24 x 36 mm is recorded on it.

Above the take-up spool 5 and above the camera body
A movable lens barrel 10 is rotatably attached to the side of the camera (not shown), and a super-telephoto lens (for example, one with a focal length of about 300 mm IJ) 11 is mounted inside the movable lens barrel 10. A first mirror 12 is provided, which is inclined at 45 degrees with respect to the optical axis of the camera, and reflects the light passing through the mirror toward the inside of the camera body. The movable lens barrel 10 rotates between a retracted position indicated by a dotted line and an imaging position indicated by a two-dot chain line.

A well-known release shaft [4] is movably fitted into a shaft cylinder 2 fixed to the winding lever 1. Release axis 1
4 is locked when the movable lens barrel 10 is not set at the photographing position, thereby making it impossible to release the camera mechanism such as the shutter. As a release lock mechanism for preventing this release, a wide protrusion lOa is formed at the end of the movable lens barrel 10, and when the movable lens barrel 10 is raised perpendicularly to the camera body, this protrusion tOa
a is retracted from under the shoulder portion 14a of the release shaft 14, and the other portions enter under the shoulder portion 14a to prevent the release shaft 14 from being pressed down.

A second mirror 16 is arranged above the exposure position at an angle of 45 degrees, receives the light reflected by the first mirror 12, and reflects the light forward. This second mirror 1
In order to receive the light from 6 and reflect it downward, the 2nd
A third mirror 17 is arranged in front of the mirror 16.

Below this third mirror 17 and in front of the exposure position,
A fourth mirror 18 is arranged to reflect the light from the third mirror 17 toward the exposure position.

When photographing, the movable lens barrel 10 is raised to protrude from the side of the camera body, as shown by the two-dot chain line. When this movable lens barrel 10 is raised, the protrusion 1 of the movable lens barrel 10
0a is retracted from below the shoulder portion 14a of the release shaft 14, allowing super-telephoto shooting. The light passing through the super-telephoto lens 11 is reflected laterally by the first mirror 12 and enters the camera body, travels parallel to the film 7, and enters the second mirror 16. The second mirror 16 reflects the incident light forward and sends it to the third mirror 17. The light reflected downward by the third mirror 17 is reflected backward by the fourth mirror 18 and reaches the film 7 at the exposure position. With these four mirrors, the image of the subject is recorded on the film 7 with its top and bottom and left and right sides aligned correctly.

After photographing, the movable lens barrel lO is rotated to the retracted position indicated by the dotted line. During the rotation of the movable lens barrel 10 and at the retracted position, the protrusion 10a of the movable lens barrel 10 gets under the shoulder 14a of the release shaft 14, so that the release shaft 14 is prevented from being pressed down, and as a result, the camera such as the shutter The mechanism will no longer be able to operate.

In addition, recently, high-sensitivity films are commercially available, so
Even with a telephoto lens with a small aperture ratio, it is possible to provide appropriate exposure without underexposure.
It is convenient for implementing the present invention.

2 to 6 show specific examples of a camera with a built-in telephoto lens according to the present invention, and the same members as in FIG. 1 are given the same reference numerals. The front surface of the camera body 20 is slightly bulged, and the lower end of the second mirror 17 and the upper end of the third mirror 18 are respectively inserted into the first bulged portion 20a. A second bulge 20b having a smaller protrusion is formed above the first bulge 20a, and the finder 21 is disposed on this second bulge 20b.

A film winding chamber 22 for storing a take-up spool 5 is formed on the right side of the camera body 20, and a cartridge storage chamber 23 for storing a cartridge 8 is formed on the left side of the camera body 20. A second exposure window (not shown) is provided between these to form an exposure position, and a fourth mirror 18 is disposed in front of this window. A winding lever 1 and a rewinding crank 24 are arranged on the upper surface of the camera body 20, respectively.

An opening for introducing light from the movable lens barrel 10 into the camera body 20 is formed on the right side of the camera body 20, and an edge 26 of this opening fits into the annular shape 110b of the movable lens barrel 10. It matches.

The movable lens barrel 10 is positioned by a locking mechanism at a retracted position aligned with the camera body 20 and at a raised photographing position. A movable mirror as this locking mechanism? f? Two engagement holes 27 are formed at positions 90 degrees apart on the outer periphery of the end of the i l O, and a lock lever 28 slidably provided on the camera body 20 engages with these. This lock lever 28 is biased by a spring 29 in the direction of engaging with the engagement hole 27, and the movable lens barrel 1
0 is engaged with one of the engagement holes 27 when it comes to the retracted position shown in FIG. 2 or the photographing position shown in FIG.

As shown in FIGS. 2 to 4, when the movable lens barrel 10 is in a position aligned with the camera body 20, the movable lens barrel 10
Since the projection tOa of the lens 0 prevents the release shaft 14 from being pressed down, super-telephoto shooting cannot be performed. When performing super-telephoto shooting, slide the lock lever 28 downward against the spring 29 and insert its tip into the engagement hole 2 of the movable lens barrel 10.
7, and then rotate the movable lens barrel lO. Fifth
As shown in the figure and FIG. 6, when the movable lens barrel lO rotates 90 degrees, another engagement hole 27 matches the tip of the lock lever 2'8, so the lock lever 28 is engaged with it by the spring 29. do. As a result, the movable lens barrel 10 is positioned at a photographing position standing vertically from the camera body 20, and at the same time, the protrusion 10a of the movable lens barrel 10 is positioned on the release shaft 14.
to allow the release shaft 14 to be pressed. When the movable lens barrel 10 is positioned at the first shadow position, the light passing through the super telephoto lens 11 is transmitted to the first mirror 12. 2nd mirror 1
It reaches the film 7 through the 6th to 4th mirrors 18 in sequence.

In the present invention, a prism can be used as the mirror, and for example, the second mirror 16, the third mirror 17, and even the fourth mirror 18 can be configured with one prism. Furthermore, in the above embodiment,
1 (Although only the VA super-telephoto lens 11 is provided, by using a movable mirror, another telephoto lens, standard or wide-angle lens can be installed.

For example, the fourth mirror 18 may be a movable mirror, a standard or wide-angle lens may be placed in front of it, and this fourth mirror 18 may be a movable mirror.
By moving to a horizontal position so as to block the optical path from the mirror 17, standard or wide-angle photography can be performed.

〔Effect of the invention〕

In the present invention having the above structure, a movable lens barrel is rotatably attached above the side of the camera body, and inside this is a telephoto lens with a very long focal length, and the light that has passed through this is sent into the camera body. In addition, multiple mirrors are placed inside the camera body to cleverly utilize the vertical, horizontal, and thickness directions of the camera body, allowing the camera body to be kept small and thin. It is possible to secure a sufficiently long optical path that corresponds to the hack focus of a telephoto lens. Further, when photography is finished, the movable lens barrel can be retracted to match the camera body, so it can be carried and stored without being bulky.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the present invention. FIG. 2 shows the camera according to the present invention, partially cut away, and is a front view with the movable lens barrel in the retracted position. FIG. 3 is a plan view of FIG. 2. FIG. 4 is a side view of FIG. 2. FIG. 5 is a front view of the camera showing the state set for super-telephoto shooting. FIG. 6 is a plan view of FIG. 5. 10...Movable lens barrel 10a...Protrusion for release lock 11...Super telephoto lens 12...First mirror 14...Release shaft 14a...Shoulder 16...Second mirror 17...Third mirror 18... - Fourth mirror 20... Camera body 22... Winding chamber 23... Patrone storage chamber 27... Engagement hole 28... Losocrehar.

Claims (3)

[Claims] (1) A camera body in which an exposure position is formed between the film winding chamber and the cartridge storage chamber, and an opening is formed in the upper side of the film winding chamber side or the cartridge storage chamber side, and this opening A movable lens barrel that is attached to the camera body and rotates between a retracted position aligned with the camera body and a shooting position that projects perpendicularly from the camera body, a telephoto lens held within this movable lens barrel, and a telephoto lens a first mirror installed in the movable lens barrel to reflect the light passing through the lens toward the aperture; and a first mirror disposed above the exposure position to reflect the light from the first mirror toward the front of the camera body. A second mirror and a second mirror located in front of the camera body.
A telephoto lens comprising: a third mirror that reflects light from the mirror downward; and a fourth mirror that is disposed in front of the exposure position and reflects light from the third mirror toward the exposure position. Built-in camera. (2) Claim 1, further comprising a release lock mechanism for preventing shutter release when the movable lens barrel is not set at the photographing position.
A camera with a built-in telephoto lens as described in section. (3) A locking mechanism is provided which automatically locks the movable lens barrel when it is rotated to a retracted position or a photographing position, and this lock is released by an external operation. A camera with a built-in telephoto lens as described in scope 2.