JPS61138930A - Camera incorporating telephoto lens - Google Patents

Abstract

PURPOSE:To facilitate operation and to prevent a selection miss by fitting a movable lens barrel which has a telephoto lens which provides large telephoto effect above a side part of a telephoto camera body, and switching optical paths associatively with the rotation of the movable lens barrel. CONSTITUTION:When telephotography with extremely large telephoto effect is carried out, the movable lens barrel 6 is pulled and raised. Consequently, the rotation of a crown gear 14 is transmitted to a gear 17 through gears 15 and 16. Consequently, a mirror 11 is rotated from the position shown by an alternate long and two short dashes line to a position shown by a solid line to form an optical path of ultra-telephotography. When telephotography with relatively large telephoto effect is performed, the movable lens barrel 6 is rotated to a position matching with the camera body. Consequently, the mirror 11 is rotated from the solid line to the alternate long and two short dashes line to form an optical path including a telephoto lens 10 with relatively large effect. Therefore, the operation is facilitated and a selection miss is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a camera with a built-in telephoto lens that is equipped with two types of telephoto lenses with different telephoto effects.

[Prior art]

Many full-size compact cameras that use 35mm roll film have a lens with a focal length of around 35mm, but with this lens you have to get very close to the subject to capture the image at a satisfactory size. I can't. To solve this problem, a camera with a built-in telephoto lens with a long focal length has been proposed (Japanese Patent Laid-Open No. 5
2-143013). This camera with a built-in telephoto lens,
A telephoto lens is placed in a position shifted laterally from the front of the exposure window, and the photographing light that passes through this telephoto lens is incident on a first mirror placed behind it, and is reflected laterally on the camera body by this first mirror. The photographing light is made to enter a second mirror placed in front of the exposure position, and the photographing light is made to enter the film through this second mirror. However, this camera uses a lens with a relatively long focal length, for example 135t.
When using an LJ (which has a telephoto effect that is about 4 times more effective than a lens with a focal length of 35 mm), its main focus is quite long, so the distance between the exposure position and the second mirror must be adjusted accordingly. Also, it is necessary to increase the distance between the second mirror and the first mirror, and as a result, the lateral length and thickness of the camera body become considerably large.

Generally, if you have a telephoto lens with a focal length of about 13 s/m IJ, it is possible to perform sufficiently satisfactory telephoto photography in most cases. However, when photographing wild birds, etc., the subject distance is quite long, and it is not possible to get very close to the subject, so a super telephoto lens with a focal length of, for example, 300 mm (compared to a lens with a focal length of 35 mm, has a telephoto effect). Therefore, it can be said that it is convenient to have a plurality of telephoto lenses with different telephoto effects.

[Purpose of the invention]

The present invention is a camera with a built-in telephoto lens that allows you to select between telephoto shooting, which has a relatively large telephoto effect, and super-telephoto shooting, which has a very large telephoto effect, while keeping the camera body small and thin. The purpose is to provide the following.

[Features of the invention]

In order to achieve the above object, the present invention secures a three-dimensional optical path by arranging a plurality of mirrors within the camera body, and also provides a first mirror above the side of the camera body that has a very large telephoto effect. Attach a movable lens barrel with a telephoto lens,
In addition, a second telephoto lens with a relatively large telephoto effect is installed on the camera body on the side of the movable lens barrel, and a mirror that switches the optical path in conjunction with the rotation of the movable lens barrel is placed behind the second telephoto lens. When the lens barrel is raised perpendicular to the camera body, only the light that has passed through the first telephoto lens reaches the exposure position via a plurality of mirrors disposed within the camera body, and the movable lens barrel is When the lens is set in a position that aligns with the camera body, only the light that has passed through the second telephoto lens reaches the exposure position. A prism can be used as the mirror, and for example, the third mirror and the fourth mirror may be one prism.

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

〔Example〕

In FIG. 1, which shows the outline of the present invention, when the winding lever 1 is operated, the winding spool 2 rotates in the direction of the arrow.
The photographed film 3 is wound around the outer periphery, and one frame of the unexposed film 3 that has been wound in a roll inside the cartridge 4 is pulled out. The take-up spool 2 is placed in a film take-up chamber, and the cartridge 4 is loaded in a cartridge storage chamber. A well-known exposure window is provided between the film winding chamber and the cartridge storage chamber, and light passing through the window is incident on the film 3 at the exposure position. This film 3 has a width of 35
mm, and a full-size screen 3a of 24 x 36 mm is recorded on this.

Above the take-up spool 2 and above the camera body
A movable mirror '@6 is rotatably attached to the side of the mirror (not shown), and includes a first telephoto lens 7 with a very long focal length, for example, about 300 mm IJ, and a It is inclined at 45 degrees with respect to the optical axis L1 of the telephoto lens 7,
A first mirror 8 is provided to reflect the light that has passed through the first telephoto lens 7 into the camera body. In addition, above the take-up spool 2, for example, a lens having a relatively long focal length is placed.
A second telephoto lens 10 of about 35 mm is arranged,
The light passing through this enters the second mirror 11 placed behind. This second mirror 11 is held by a mirror holder 12, and a rotating shaft 1 fixed to the mirror holder 12
3 as a fulcrum, and rotates by 45 in the transverse direction with respect to the optical axis L2.
The optical axis L2 is moved between a position tilted at an angle of 1° and a position perpendicular to the optical axis L2 as shown by a two-dot chain line.

The second mirror 11 rotates in conjunction with the movable lens barrel 6,
Switches the optical path of the telephoto lens. For this purpose, a crown gear 14 is provided at the end of the movable lens barrel 6, and a pinion gear 15 meshes with the crown gear 14. This rotation of pinion gear 15 is transmitted to gear 17 via intermediate gear 16. This gear 17 is the rotating shaft 1 of the mirror holder 12.
The protruding lever part 17 is loosely fitted to the upper end of 3.
a pushes the mirror holder 12 against the spring 18 and retracts the second mirror 11 from the reflected optical path of the first mirror 8. Furthermore, when the gear 17 rotates counterclockwise, the lever part 17a retracts, so the mirror holder 12 enters the reflection optical path of the first mirror 8, and is held and positioned by the fixing pin 19.

A third mirror 20 is arranged above the exposure position at an angle of 45 degrees, receives the light reflected by the first mirror 8 or the second mirror 11, and reflects the light forward. A fourth mirror 21 is arranged next to the second telephoto lens 10 to receive this forward reflected light and reflect it downward. A fifth mirror 22 is arranged below the fourth mirror 21 and in front of the exposure position.

When performing super-telephotography with a very large telephoto effect, the movable lens barrel 6 is raised to protrude from the side of the camera body, as shown by the solid line. When the movable lens barrel 6 is raised, the rotation of the crown gear 14 is caused by the rotation of the pinion gear 15.
It is transmitted to gear 17 via intermediate gear 16. When this gear 17 rotates, the second mirror 11 is pushed by the lever part 17a, and the optical path of the second telephoto lens IO is changed from the position where it hits the fixing pin 19 as shown by the two-dot chain line to the optical path of the second telephoto lens IO as shown by the solid line. Evacuate to a coverd position. For this reason, the light passing through the first telephoto lens 7 is transmitted from the first mirror 8 degrees to the third mirror 20 degrees. Fourth mirror 21. It passes sequentially through the fifth mirror 22 and reaches the film 3 at the exposure position, and the film 3 is exposed with the image of the subject aligned vertically and horizontally.

When performing telephoto photography with a relatively large telephoto effect, the movable lens barrel 6 is rotated to a position aligned with the camera body, as shown by the two-dot chain line. When this movable lens barrel 6 rotates,
The stored force of the spring 18 moves the second mirror 11 from the retracted position shown by the solid line to the position shown by the two-dot chain line, thereby blocking the optical path of the first telephoto lens 7. In this case, the photographing light passing through the second telephoto lens 10 is transmitted to the second mirror 11. Third mirror 20, fourth mirror 21. The light then passes through the fifth mirror 22 and reaches the film 3 at the exposure position. Note that each of the mirrors 8, 11, 20-22 does not have to be inclined at 45 degrees with respect to the optical axis, and the angle can be changed appropriately depending on the arrangement position of the mirror. Also,
Recently, high-sensitivity films have been commercially available, so even with a telephoto lens with a small aperture ratio, it is possible to provide appropriate exposure without underexposure, which is convenient for carrying out the present invention. good.

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 25 is slightly bulged, and the lower end of the fourth mirror 21 and the upper end of the fifth mirror 22 fit into the first bulged portion 25a. A second bulge 25b is formed above the first bulge 25a, and the second bulge 25b has a smaller protrusion than the first bulge 25a. It is located. A second mirror 11 is arranged behind the second telephoto lens 10 so as to be rotatable about a shaft 13, and the second telephoto lens 10 and the finder 26
The third mirror 20 and the fourth mirror 21 are respectively arranged between them.

A take-up spool 2 is located below the second telephoto lens 10.
A film winding chamber 27 is formed in which the cartridge 4 is stored, and a cartridge storage chamber 28 is formed below the finder 26 in which the cartridge 4 is stored. An exposure window (not shown) for forming an exposure position is provided between these, and the fifth mirror 22 is disposed in front of this window. A winding lever l and a rewinding crank 29 are arranged on the upper surface of the camera body 25, respectively. Note that, of course, the positions of the first telephoto lens 10 and the finder 26 may be exchanged.

An opening for introducing light from the movable lens barrel 6 into the camera body 25 is formed on the right side of the camera body 25, and an edge 30 of this opening fits into the annular groove 6 of the movable lens barrel 6.
It is fitted in a. This movable lens barrel 6 is the camera body 25
In order to position the movable lens barrel 6 in an aligned state and a raised state, click two clicks>431 at positions 90 degrees apart on the outer periphery of the end of the movable lens barrel 6.
A click ball 32 provided on the camera body 25 fits into this. This click pole 32
is biased by a spring 33 in the direction of fitting into the click a31. Note that instead of this click mechanism, for example, a sliding lock mechanism may be provided so that the movable lens barrel 6 rotates only when this lock mechanism is operated.

As shown in FIGS. 2 to 4, when the movable lens barrel 6 is aligned with the camera body 25, the second mirror 1
1 blocks the optical path of the first telephoto lens 7, so the second
Only the light that has passed through the telephoto lens lO reaches the exposure position. As shown in FIGS. 5 and 6, when the movable lens barrel 6 is in the state of being raised from the camera body 25, the second mirror 11 is in the retracted position, so that the light passing through the first telephoto lens 7 only reaches the exposure position.

〔Effect of the invention〕

The present invention having the above configuration includes a movable lens barrel rotatably mounted above the side of the camera body, a first telephoto lens with a very long focal length inside the lens barrel, and light that has passed through this lens 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 becomes possible to secure a sufficiently long optical path without changing the structure. In addition to the first telephoto lens, a second telephoto lens with a smaller telephoto effect is provided on the front of the camera body, so that two types of telephoto shooting with different telephoto effects can be selected. Furthermore, these two types of telephoto shooting are automatically selected in conjunction with the rotation of the movable lens barrel, making the operation easy and
It is possible to prevent selection errors from occurring.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing the present invention. FIG. 2 shows a partially cutaway view of the camera according to the present invention, and is a front view of the camera set for telephoto shooting. 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. 2... Take-up spool 3... Film 4... Cartridge 6... Movable lens barrel 7... First telephoto lens 8... First mirror 10... Second telephoto lens 11... 2 Mirror 12...Mirror holder 14...Crown gear 20...Third mirror 21...Fourth mirror 22...Fifth mirror 25...Camera body 26...Finder 27...Film winding chamber 28...Patrone Storage room.

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 rotatably attached to the camera body so as to cover the lens; a first telephoto lens with a very long focal length held within the movable lens barrel; A first mirror attached to a movable lens barrel to reflect light toward the aperture, a second mirror placed on the reflection optical path of the first mirror, and a state in which the movable lens barrel is aligned with the camera body. interlocking operation in which the second mirror is inserted into the reflected optical path of the first mirror when the camera body is moved, and the second mirror is retracted from the reflected optical path of the first mirror when the movable lens barrel is raised to be perpendicular to the camera body. a second telephoto lens that is placed in front of the second mirror and has a relatively long focal length; and a second telephoto lens that is placed above the exposure position and that directs the light reflected by the first mirror or the second mirror to the camera body. a third mirror that reflects the light in front of the camera body; a fourth mirror that is disposed in front of the camera body and reflects the light from the third mirror downward; and a fourth mirror that is disposed in front of the exposure position and reflects the light from the fourth mirror to expose the camera body. A camera with a built-in telephoto lens characterized by comprising a fifth mirror that reflects light toward a certain position. (2) The camera with a built-in telephoto lens according to claim 1, wherein the second mirror is fixed to a mirror holder having a rotation axis. (3) The interlocking mechanism includes a crown gear provided on a part of the movable lens barrel inserted into the camera body, and a gear that is loosely fitted to the rotating shaft of the mirror holder and rotates in conjunction with the crown gear. , comprising a protrusion provided on the gear that pushes the mirror holder to retreat from the reflected optical path of the first mirror, and a spring that urges the mirror holder to enter the reflected optical path of the first mirror. A camera with a built-in telephoto lens according to claim 2.