JPH11142712A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a camera and to accurately realize variable power in a real image type zoom finder by providing a large gear engaged with a cam pin erected on the straight advance moving member of a lens barrel and arranging a solid cam integrally formed with a small gear meshed with the large gear near the back surface of the reflection surface of a zoom finder. SOLUTION: Relating to the real image type zoom finder in a finder unit; the cam pin 31 is erected on the straight advance moving member of the lens barrel holding a photographing lens being a zoom lens and performing variable power operation in an optical axis direction. Then, a cam member 32 is equipped with a cam engaged with the cam pin 31 and the large gear 32b and is moved only in a direction orthogonal to the optical axis of the photographing lens. The solid cam 54 integrally formed to be coaxial with the small gear meshed with the gear 32b and moving a moving lens in an optical axis direction is arranged under an objective lens and near the back surface of the 3rd reflection surface 45d of the porro-prism 45 of the real image type zoom finder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention achieves miniaturization of a camera, and is particularly suitable for a camera with a zoom lens provided with a real image type zoom finder aiming at miniaturization.

[0002]

2. Description of the Related Art In recent years, competition in miniaturization of cameras with a zoom lens provided with a real image type zoom finder has intensified. A Porro prism is often used in a real image type zoom finder. However, when a Porro prism is used, two other three-dimensional optical paths parallel to the optical axis of the objective lens are required, and also in the height direction. A predetermined space is required, which hinders miniaturization.

Further, in a zoom finder using a roof prism as disclosed in Japanese Patent Application Laid-Open No. 2-201304, the optical path parallel to the optical axis of the objective lens is only in the horizontal direction, but many light paths in the depth direction. There is a problem that a space is required and a dimension in a thickness direction of the camera is increased.

Further, Japanese Patent Application Laid-Open No. Hei 2-201304 describes a three-dimensional cam for moving a moving lens in an objective lens in an optical axis direction in a zoom finder and a gear train for rotating the three-dimensional cam.

In a camera, a strobe, AF, A
E, Regarding the battery used for the power supply such as automatic winding,
Conventionally, many batteries are elongated in the longitudinal direction, and a method of placing the battery vertically on a side surface of a camera body or a method of placing the battery horizontally below a photographing lens has been generally used. However, in recent years, the progress of batteries has been remarkable, and the size of batteries used in cameras has been reduced.

In recent years, a camera loaded with an APS film has been marketed. However, this type of camera is capable of arbitrarily selecting a desired print size from a classic size, a high definition size, and a panorama size by an external operation. The information of the selected print size is magnetically recorded on the APS film in the camera, and the lab selects the print size based on the magnetic information.

[0007]

In a camera equipped with a conventional real image type zoom finder (hereinafter, referred to as a finder), when a zoom lens of a photographing lens is moved to perform a zooming operation, an optical axis in a lens barrel is changed. A part of the member moving in the direction engages with the first cam on the cam plate to move the cam plate in a direction perpendicular to the optical axis of the taking lens, and further the second cam moves the object in the finder through the objective lens. Is moved in the optical axis direction. The cam plate may be formed in an arc shape or in a flat shape.

There are two types of second cams. One of the second cams is a cam groove provided in a cam plate as disclosed in Japanese Patent Application Laid-Open No. 9-21554, and is a movable lens of a finder. A cam pin protruding from a member for supporting the lens is engaged with the cam groove, and the movable lens is moved in the optical axis direction by the cam groove via a cam plate that moves as the lens barrel advances and retreats. However, this configuration has the advantage that no extra space is required in the vertical direction because both the cam grooves, which are the first cam and the second cam, are provided on the cam plate. If the backlash is loose, the finder will be inaccurate. In particular, in an ultra-small camera configured to be small in size as a whole, this slight error greatly affects the field of view of the viewfinder and the like. In addition, since the cam plate is a relatively large planar member, it is difficult to integrate it with the finder unit. As a result, if the finder unit is not assembled to the camera, error adjustment cannot be performed, resulting in blurring of the finder. There is a problem that it is easy to cause.

The other second cam is a three-dimensional cam provided with a large gear or rack on a cam plate and formed coaxially with a small gear meshing with the large gear. Then, a cam pin protruding from a member supporting the moving lens of the finder is pressed against the three-dimensional cam by a spring. Therefore, by moving the lens barrel forward and backward, the first cam rotates the large gear together with the cam plate in a direction orthogonal to the optical axis of the photographing lens, rotates the small gear by the large gear, and rotates the coaxial three-dimensional cam. The moving lens is moved back and forth in the optical axis direction. According to this configuration, since the cam pin is always pressed against the three-dimensional cam, there is no problem of rattling due to the cam, and the cam pin is easily integrated with the finder unit. Since a three-dimensional cam requires a space in the vertical direction, it is difficult to apply it to a micro camera.

In the case of a real image type zoom finder using a Porro prism, four reflecting surfaces for reflecting object light at right angles are arranged, and each reflecting surface is configured to reflect in a different direction. Is 4 with respect to the incident optical path.
Since they are arranged at an angle of 5 degrees, there is a dead space near the rear surface of the reflecting surface that becomes a substantially right triangle when viewed from one side.

It is a first object of the present invention to pay attention to this dead space and to propose a camera with a zoom lens incorporating the dead space described above.

Also, as described above,
No. 4 describes a three-dimensional cam and a gear train, but the three-dimensional cam and the gear are formed as separate parts. However, if the three-dimensional cam and the gear are formed as separate parts, it is difficult for the position of the gear teeth and the position of the cam to coincide in the rotational direction, and this greatly affects the accuracy of the finder especially in a micro camera. In order to solve this problem, cameras in which a three-dimensional cam and a gear are integrally formed are commercially available.

For example, there is one having a shape as shown in FIG. In the drawing, reference numeral 114 denotes a three-dimensional cam, and 115 denotes a gear. When the gear 115 rotates, a cam pin (not shown) advances and retreats along the cam surfaces 114a and 114b of the cam 114. When this member is molded, the split surfaces of the fixed mold and the movable mold, that is, the parting line (P · L) are at the positions shown in the figure, and the parting lines shown by the broken lines correspond to the cam surfaces 114a and 114b. However, burrs are likely to occur on the parting line. Therefore, when the cam pins abut against the burrs of the cam surfaces 114a and 114b, there is a problem that the accuracy of the finder is adversely affected.

Further, if the shape is as shown in FIG. 2, no burr is generated on the cam surfaces 124a and 124b, so that the above-mentioned problem is solved. However, since a mold for molding the three-dimensional cam 124 and a mold for molding the gear 125 are different molds, it is difficult to obtain sufficient precision in a zoom finder of a very small camera requiring high precision.

In view of such a problem, at least a cam surface for moving a high-sensitivity moving lens having a strong power,
A second object is to propose a camera molded using the same mold as the gear.

As described above, the miniaturization of the battery has increased the degree of freedom in the location of the battery. Also, due to the miniaturization of the strobe light emitting unit, attempts have been made to arrange the battery behind the strobe light emitting unit. However, above the camera body, a light emitting unit and a light receiving unit for distance measurement are arranged at both ends of the zoom finder, in order to secure a predetermined base line length, including the above-described zoom finder, and are arranged alongside the strobe light emitting unit. In. No matter how small the battery is, it is still large compared to other members, and it was difficult to arrange the battery behind the strobe light emitting part in a micro camera.

In order to reduce the size, simply reducing the distance between the light projecting lens of the light projecting unit and the light projecting element, and the distance between the light receiving lens of the light receiving unit and the light receiving element, simply requires the light projecting lens and the light receiving lens In this case, a single focus lens is used, which results in a wide angle lens, which is not preferable.

In view of such a problem, it is proposed to provide a camera in which a large-sized member such as a battery or a main capacitor of a strobe is arranged near a light-emitting unit or a light-receiving unit for distance measurement and which can be downsized. This is a third object of the present invention.

Further, when a battery is disposed near the light-emitting unit or the light-receiving unit for distance measurement as described above, if the battery leaks, it may have a great effect on surrounding electronic components. A fourth problem is to propose a camera that takes this point into account.

In a camera loaded with an APS film, a desired print size can be arbitrarily selected from a classic size, a high definition size, and a panorama size by an external operation. When the contact piece interlocking with slides on the conductive pattern provided on the printed circuit board, an electric signal corresponding to a desired print size is output, and finally the magnetic head magnetically records on the APS film. ing.

However, the contact between the contact piece and the conductive pattern provided on the printed circuit board is not always highly reliable. In some cases, magnetic information different from the desired print size is recorded on the APS film due to poor contact. There is
In this case, the user who is photographing does not know at all, and only after receiving the print at the photo store, will the abnormal be known. In addition, even in such a situation, a general user tends to think that the operation of the lab is incorrect, not that the camera has failed.

In view of such a problem, a fifth object is to propose a camera having high reliability in selecting a print size.

[0023]

The first object of the present invention is to provide an objective lens comprising a fixed lens and a moving lens, which performs zooming by moving the moving lens in the direction of the optical axis, and an object emitted from the objective lens. A first reflecting surface for reflecting the subject image at a right angle, a second reflecting surface for reflecting the subject image reflected at the first reflecting surface at a right angle, and projecting in a direction parallel to and opposite to the optical axis of the objective lens; A third reflecting surface for reflecting the subject image reflected by the second reflecting surface at right angles and emitting the subject image in a direction perpendicular to the optical axis of the objective lens; and reflecting the subject image reflected on the third reflecting surface at right angles. A fourth reflecting surface that emits light parallel to the optical axis of the objective lens, and an eyepiece that receives and magnifies the subject image reflected by the fourth reflecting surface and emits the image to a position corresponding to the pupil of the photographer. Equipped with a real image type zoom finder with In a camera, a lens barrel holding a photographing lens as a zoom lens and performing a magnification change operation in an optical axis direction, a cam pin erected on a member that moves straight in the lens barrel, a cam engaged with the cam pin, and a large gear A cam member that moves only in a direction perpendicular to the optical axis of the photographing lens, a small gear that meshes with the large gear, and that is integrally formed coaxially with the small gear, and the movable lens And a three-dimensional cam for moving the three-dimensional cam in the optical axis direction, wherein at least the three-dimensional cam is disposed below the objective lens and near the back surface of the third reflection surface.

The second problem is that a zooming lens of a zoom finder is moved in the optical axis direction by a gear rotating with the zooming operation of the zoom lens and a cam surface integrally formed with the gear and provided in the axial direction. Wherein the outer diameter of a shaft adjacent to the gear is equal to or larger than the outer diameter of a peak of the gear, and the three-dimensional cam adjacent to the shaft. An outer diameter of the three-dimensional cam is formed larger than an outer diameter of the shaft, and the cam surface is formed on the gear side, and a parting line is arranged on an outer peripheral surface of the three-dimensional cam. Is done.

The third problem is that a light emitting element that emits infrared light toward a subject, or a light receiving element that receives infrared light reflected by a subject, and an infrared light from the light emitting element or the light receiving element that receives the infrared light. A condenser lens for condensing infrared light to the element, the light-emitting element or the light-receiving element, and a reflecting mirror disposed between the condenser lens and reflecting emission light or incident light at a substantially right angle. The camera is characterized in that a cylindrical battery or a strobe main condenser is horizontally arranged near the back surface of the reflector.

The fourth object is to provide a light emitting element that emits infrared light toward a subject, a light receiving element that receives infrared light reflected by the subject, and an infrared light from the light emitting element or the light receiving element that receives the infrared light. A condenser lens for condensing infrared light to the element, the light-emitting element or the light-receiving element, and a reflecting mirror disposed between the condenser lens and reflecting emission light or incident light at a substantially right angle. The camera is characterized in that a battery chamber for accommodating a cylindrical battery is disposed horizontally in the vicinity of the back surface of the reflector.

The fifth problem is that an APS film is loaded and a desired print size is selected from a classic size, a high-definition size, and a panorama size by an external operation. A camera for magnetically recording on an APS film, comprising: a switch actuating member that is rotated by an external operation; and two movable parts, and the printing is performed by determining whether at least the two movable parts are pressed by the switch actuating member. An integrated switch for outputting a signal corresponding to a size is provided, and information of a selected print size is magnetically recorded on an APS film based on a signal of the integrated switch.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a zoom lens barrel of a camera according to the present invention will be described with reference to FIG. FIG. 3 is a vertical cross-sectional view of the zoom lens barrel. The upper half of the optical axis shows a state in which a short focus is set, and the lower half of the optical axis shows a state in which a long focus is set. It is painted.

In both figures, reference numeral 1 denotes a fixed body, which carries all members described below and is fixed to a camera body (not shown). The fixed body 1 has a female helicoid 1 on the inner circumference.
a is screwed, and two guide grooves (not shown) for a rectilinear guide described later are provided substantially symmetrically with respect to the optical axis O and parallel to the optical axis O. Reference numeral 2 denotes a cam cylinder, on the outer periphery of which a male helicoid 2a screwed with the female helicoid 1a and a large gear 2b are integrally formed, and on the inner periphery, a female helicoid 2a.
c and the first cam groove 2d are formed. Further, since the diameter of the addendum circle of the large gear 2b is formed smaller than the root diameter of the male helicoid 2a, it does not come into contact with the peak of the female helicoid 1a of the fixed barrel 1. Reference numeral 3 denotes a decorative frame that covers the female helicoid 2c and the like of the cam cylinder 2.

Reference numeral 4 denotes a second lens group holding frame, and the second lens group L _{F2 in} the front lens group of the zoom lens is provided on the inner periphery of the frame.
, And the second lens group L _F2 is pressed by a lens holding plate 5 made of a thinner plate from the rear. A male helicoid 4 a is screwed around the outer periphery, and the male helicoid 4 a is screwed with the female helicoid 2 c of the cam cylinder 2.

Further, the front outer periphery 4 of the second lens group holding frame 4
“c” is exposed to the external appearance as it is and is one of the exterior members.

A first lens group holding frame 6 for holding the first lens group L _F1 in the front lens group is disposed in front of the second lens group holding frame 4, and the first lens group holding frame 6 is a diaphragm. It is fixed to the second lens group holding frame 4 with the shared shutter blade 7 interposed therebetween. Further, circuits and actuators for driving the shutter blades 7 are respectively provided at positions of the front portion 8 of the first lens group holding frame 6.

Reference numeral 11 denotes a rear lens group holding frame for holding the rear lens group L _R , and convex portions 11 a provided in three places on the outer periphery of the rear lens group holding frame 11 and parallel to the optical axis, and a second lens group. Recesses 4b parallel to the optical axis provided at three places on the inner rear side of the holding frame 4 are engaged. Therefore, the rear lens group holding frame 11 is held by the second lens group holding frame 4 while maintaining the same optical axis, and the rear lens group holding frame 11 slides with respect to the second lens group holding frame 4 in the optical axis direction. It can move, but cannot rotate about the optical axis. Also, three first cam pins 12 are provided upright on the convex portion 11a of the rear lens holding frame 11, and engage with the first cam groove 2d provided on the inner periphery of the cam cylinder 2 together with the female helicoid 2c. I agree.

A rectilinear guide plate 13 bent in an L-shape by a metal plate is rotatably attached to the rear portion 2e of the cam cylinder 2 about an optical axis O by a member (not shown).
The rectilinear guide plate 13 includes two rectilinear guide portions 13 parallel to the optical axis O.
a, the rectilinear guide portion 13a passes outside the outer circumference of the rear lens group holding frame 11 and engages with the long groove and the through hole provided on the inner circumference of the second lens group holding frame 4. On the other hand, the rectilinear guide plate 13 has two protrusions 13b orthogonal to the optical axis O, and engages with two long guide grooves, not shown, provided on the fixed body 1 and parallel to the optical axis O. doing.

Therefore, when the cam barrel 2 advances and retreats while rotating, the straight guide plate 13 is prevented from rotating by the projection 13b and performs only the straight movement together with the cam barrel 2. For this reason,
The rotation of the second lens group holding frame 4 is prevented by the rectilinear guide portion 13a, and only the rectilinear movement is performed. Also, since the rear lens holding frame 11 is slidably engaged with the second lens group holding frame 4 only in a direction parallel to the optical axis, the rear lens holding frame 11 also only moves straight.

The shutter driving member is the second
Since a sufficient space is provided in front of the lens group holding frame 4 and behind the second lens group holding frame, a relationship between the concave portion 4b of the second lens group holding frame 4 and the convex portion 11a of the rear group holding frame 11 is provided. The combined length can be sufficiently set, and the optical axis of the first lens unit L _{F1, that} is, the optical axis of the front lens unit and the rear lens unit L surely match.

In addition, there is a play in the direction parallel to the optical axis between the first cam pin 12 erected on the rear lens holding frame 11 and the first cam groove 2d of the cam barrel 2 due to processing accuracy. I have. In order to absorb the backlash, the second lens unit L _F2
Projections 5 a are provided at three places on the outer periphery of the lens holding plate 5 for holding the lens, and a tension spring 14 is similarly attached between the projections 11 b provided on the rear lens holding frame 11. As a result, the first cam pin 12 is always urged forward in the first cam groove 2d,
Since only the front side surface of the first cam groove 2d abuts, the backlash of the first cam pin 12 is eliminated.

As described above, the shutter driving member is the second
Since it is located in front of the lens group holding frame 4, the tension spring 14 can be attached in this manner.

On the contrary, the rear lens group holding frame 11
It is also possible to provide a first cam groove and a first cam pin on the cam cylinder 2.

In front of the first lens unit L _F1 ,
In order from the lens group L _F1 side, a lens cover 21 composed of two members, a lens cover base 23 that rotatably supports the lens cover 21, a lens cover ring 24 that opens and closes the lens cover 21, and a thin plate are drawn. A decorative frame 25 covering these members is disposed.

The operation of the zoom lens barrel having the above configuration will be described below.

When a main switch (not shown) is turned on, a motor (not shown) rotates to rotate the large gear 2b of the cam cylinder 2 via a reduction gear (not shown).
Then, the cam cylinder 2 is extended from the fixed barrel 1 in accordance with the lead of the male helicoid 2a while rotating. When the cam cylinder 2 rotates, the rotation is transmitted to the male helicoid 4a of the second lens group holding frame 4 by the female helicoid 2c, but the rotation of the second lens group holding frame 4 is prevented by the rectilinear guide plate 13. Therefore, it is fed straight out according to the lead of the male helicoid 4a.

The second lens unit L _F2 includes a second lens unit holding frame 4
The first lens group L _F1 is held by the first lens group holding frame 6, and the first lens group holding frame 6 is held by the second lens group holding frame 4 with the shutter blade 7 interposed therebetween.
Because it is secured to, the first lens group L _F1 is the front lens group and the second lens unit L _F2 while keeping constant the distance between the lenses, it will be that fed in accordance with the lead of the two helicoid.

On the other hand, the rotation of the first cam groove 2d of the cam barrel 2 moves the first cam pin 12 in the optical axis direction, and the rear lens group holding frame 11 is prevented from rotating by the second lens group holding frame 4. Therefore, the rear lens group holding frame 11 is straightly extended according to the shape of the cam of the first cam groove 2d. Therefore, the rear group lens _LR is the male helicoid 2a of the cam barrel 2.
In accordance with the shape of the lead and the cam.

Next, the zooming operation and the focusing operation in the present zoom lens barrel will be described. This zoom lens barrel is a so-called step zoom system in which a section between the wide-angle end and the telephoto end is divided into a predetermined number of steps, that is, steps, and the zooming operation and the focusing operation can be performed by the same mechanism. Because you can
A compact and simple zoom lens barrel can be realized.

Referring to the step zoom diagram of FIG. 4, the horizontal axis indicates a change in the focal length, and is divided into six steps from the wide-angle end W to the telephoto end T. The vertical axis indicates the amount of movement of the front lens group and the rear lens group of the zoom lens in the optical axis direction. As described above, the front group lens moves linearly because it moves only by the helicoid, but the rear group lens moves by the cam, so that an arbitrary movement diagram can be provided. For example, when the focusing operation is performed from a state at infinity で which is an initial position at the wide angle end W, the lens is moved to a state at a close distance N. Explanation This state corresponds to the closest distance N of the initial position at the focal length M ₁ of the wide angle to the second, when performing a focusing operation at the focal length M ₁ of the wide-angle to the second, endless from the state of the close range N Move the lens to the state at a distance. Infinity ∞ state of the second wide-angle focal length M ₁ to correspond to infinity ∞ initial position at the focal length M ₂ of the wide angle to the third. As described above, in the step zoom method, since the focusing operation is performed while performing the magnification operation, that is, while changing the focal length, the magnification operation and the focusing operation can be performed by the same mechanism.

Next, the zoom finder will be described with reference to FIGS.

FIG. 5 is a perspective view of a zoom lens barrel, a zoom finder unit and the like.

In FIG. 5, the fixed barrel 1, the cam barrel 2, the second
The lens holding frame 4 has been described with reference to FIG. A long hole 1b is formed in the side surface of the fixed body 1 in the optical axis direction, and a second cam pin 31 is provided upright at a bent portion 13c obtained by bending a part of the rectilinear guide plate 13 forward. More protruding. A cam member 32 and a finder unit 40 are arranged on the fixed body 1, and a second cam pin 31 is engaged with a second cam groove 32 a provided on the back surface of the cam member 32.
The second cam pin 31 advances and retreats in the optical axis direction.
Since the position of the fixed body 1 is regulated without moving in the optical axis direction by the regulating portions 1c and 1d protruding in the circumferential direction of the fixed body 1, the side surface 1e of the fixed body 1 is rotated only in the circumferential direction.

On the outer periphery of the cam member 32, a large gear 32
b, which meshes with a small gear (not shown in FIG. 5) provided in the finder unit 40, which will be described later.

Next, the configuration of the real image type zoom finder in the finder unit 40 will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view of an objective lens and the like of the real image type zoom finder, and FIG. FIG. 7A is a cross-sectional view of the zoom finder, FIG. 7A is a horizontal cross-sectional view, and FIG. 7B is a vertical cross-sectional view.

In both figures, the optical system of the real image type zoom finder will be described. The objective lens is a first lens 41 which is a concave lens, a second lens 42 which is a convex lens, a third lens 43 which is a concave lens, and a fourth lens which is a convex lens. It is composed of a lens 44. The subject image transmitted behind the objective lens enters from the entrance surface 45a of the Porro prism 45 having a gentle convex surface, is reflected downward by 90 degrees on the first reflection surface 45b, and is forwardly reflected on the second reflection surface 45c by 90 degrees. Degree, and further reflected 90 degrees sideways on the third reflecting surface 45d,
The light is emitted from an emission surface 45e having a gentle convex surface. At this time, since the subject image is formed by the objective lens near the exit surface 45e, the field frame 46 is disposed near the exit surface 45e. The subject image emitted from the emission surface 45e is further reflected back 90 degrees by the reflecting mirror 47, which is the fourth reflecting surface, and forms an image at a position corresponding to the photographer's pupil by the eyepiece lens. In this way, the photographer can visually recognize the real subject image that is erected vertically and horizontally.

The first reflecting surface 45b and the second reflecting surface 45
Although c and the third reflecting surface 45d are configured by the Porro prism 45, each reflecting surface may be an independent reflecting mirror.

Here, the objective lens is composed of four lenses as described above, but the finder according to the present embodiment is a zoom finder that performs zooming, and includes a first lens 41 and a fourth lens. 44 is a fixed lens, and the second lens 42 and the third lens 43 are moving lenses.

Then, the first lens 41 and the second lens 4
Each of the second, third and fourth lenses 43 and 44 has a first arm portion 41a, 42a, 43a, 44a in a direction normal to the outer peripheral edge.
And the second position is substantially symmetrical with respect to the optical axis O.
It has arms 41b, 42b, 43b, 44b. Through holes 41c, 42c, 43c, 44c are formed in the first arms 41a, 42a, 43a, 44a, respectively, and cutouts 41 are formed in the second arms 41b, 42b, 43b, 44b.
d, 42d, 43d, and 44d are provided.

The through holes 41c, 42c, 43c, 4
4c and the notches 41d, 42d, 43d, and 44d
A substantially symmetrical position with respect to the optical axis O is desirable, but if all four lenses are at the same position, the through holes 41c, 42c, 4
3c, 44c and notches 41d, 42d, 43d, 44
There is no practical problem even if the distance from the optical axis to d is slightly different.
Even if it is not shifted by 0 degrees, there is no practical problem as long as it is substantially opposite to the optical axis O.

Reference numeral 50 denotes a finder base which inserts and holds a first guide shaft 51 and a second guide shaft 52 parallel to the optical axis O. Therefore, when each lens is incorporated in the finder base 50, the second lens 42, the third lens 43, and the fourth lens 44 are arranged in the finder base 50, and the first guide shaft 51 and the second guide shaft 52 are connected. Inserted from one end of the finder base 50, the first guide shaft 51 is fitted through the through hole 42c of the second lens 42, the through hole 43c of the third lens 43, and the through hole 44c of the fourth lens 44,
The second guide shaft 52 is connected to the notch 42d of the second lens 42,
The cutout 43d of the third lens 43 and the cutout 44d of the fourth lens 44 are fitted. Subsequently, from the outer surface 50a side of the finder base 50, the through-hole 4 of the first lens 41 is formed.
1 c is fitted to the first guide shaft 51, and the notch 41 d of the first lens 41 is fitted to the second guide shaft 52.

Here, the through holes 41c, 42c, 43c,
44c is fitted with the first guide shaft 51 with high precision, and the notches 41d, 42d, 43d and 44d are also in the width direction (circumferential direction).
At a high accuracy with the second guide shaft 52. Further, in each lens, the through holes 41c, 42c, 43
c, 44c and notches 41d, 42d, 43d, 44d
Are provided at the same position about the optical axis O. Therefore, when the first guide shaft 51 and the second guide shaft 52 are fitted into each lens and incorporated into the finder base 50,
The optical axis O of each lens coincides with high accuracy.

The first lens 4 is used as a fixed lens.
After the first arm 41a and the second arm 41b of the first lens abut on the outer surface 50a of the finder base 50 and are positioned in the optical axis direction, they are fixed with an adhesive or the like, and the first arm 44a of the fourth lens 44 is formed. And the second arm portion 44b are brought into contact with the inner surface 50b of the finder base 50 to determine the position in the optical axis direction, and then fixed with an adhesive or the like.

On the other hand, a second lens 42 as a moving lens
And the third lens 43, the first lens 41 and the fourth lens 44
Are slidably held by the first guide shaft 51 and the second guide shaft 52. First arm 42 of second lens 42
a pin 42e is provided upright on the upper portion of the first arm 43a, and a pin 43e is provided upright on the first arm portion 43a of the third lens 43.
A tension spring 43 is stretched between the pin e and the pin 43e, and urges the second lens 42 and the third lens 43 toward each other. A third cam pin 42f is provided below the first arm 42a of the second lens 42, and a fourth cam pin 43 is provided below the first arm 43a of the third lens 43.
When the third cam pin 42f is disposed below the third cam pin 42f and the fourth cam pin 43f, the third cam pin 42f contacts the first cam face 54a of the three-dimensional cam 54, and the second cam face 5
The fourth cam pin 43f abuts on 4b.

A small gear 55 is integrally formed at the tip of the three-dimensional cam 54, and the large gear 3 of the cam member 32 shown in FIG.
2b. Therefore, the large gear 32b rotates and the small gear 55 rotates with the zooming operation of the taking lens, and the rotation of the three-dimensional cam 54 causes the second lens 42 and the third lens 42 to rotate.
The lens 43 slides in the direction of the optical axis O to perform a zooming operation of the zoom finder.

As described above, in the objective lens of the present embodiment, the fixed lens is held by the two guide shafts, and the moving lens is also held directly by the two guide shafts without passing through the moving lens frame as in the conventional case. Therefore, the optical axes of the lenses are easily aligned, and shift and tilt between the lenses are less likely to occur.

Since the first lens 41 and the fourth lens 44 do not move, the through holes 41c and 44c and the
1d and 44d are a first guide shaft 51 and a second guide shaft 52
However, since the second lens 42 and the third lens 43 slide, the through holes 42c, 43c and the notches 42d, 43d are fitted to the first guide shaft 51 and the second guide shaft 52. Therefore, slightly loose fitting is desirable.

FIG. 8 is a development view of the second cam groove 32a of the cam member 32. The zoom lens barrel described with reference to FIG. 3 performs the following unique operation together with the second cam pin 31.
That is, when the zooming operation is performed from the wide-angle end to the telephoto end, the second cam pin 31 slides along the front surface 32b of the second cam groove 32a and stops at a predetermined focal length. Is retracted from the stopped position 31a by the width of the second cam groove 32a, and stops at the position 31b in contact with the rear surface 32c of the second cam groove 32a. Thereafter, when a focusing operation is performed, the second cam pin 31 moves forward in a range of a position 31a ahead of the rear position 31b according to the focusing distance.

As described above with reference to the step zoom diagram of FIG. 4, the zoom lens barrel according to the present invention has a focal length that changes even when a focusing operation is performed. If the second cam pin 32 has no play with respect to the second cam pin 31, the cam member 32 will rotate during the focusing operation, and as a result, the small gear 55
This causes the three-dimensional cam 54 to rotate via the zoom lens, causing the zoom finder to perform a zooming operation. Since the user is looking through the viewfinder during shooting, it is very difficult to see if the viewfinder changes magnification during focusing. This is to prevent such a situation.

Next, molding of the three-dimensional cam 54 described with reference to FIG. 6 will be described.

The three-dimensional cam shown in FIG. 9 is the three-dimensional cam 5 shown in FIG.
4, the outer diameter of the shaft 54c is equal to or larger than the outer diameter of the pinion 55, and the outer diameter of the three-dimensional cam 54 is larger than the outer diameter of the shaft 54c. Therefore, on the outer peripheral surface 54d of the three-dimensional cam 54, the first cam surface 54a and the second cam surface 54
If the parting lines P and L are set at positions where they do not touch b, burrs do not occur on the cam surface as in the prior art shown in FIG. The small gear 55 and the second cam surface 5
4b, one of which is a fixed type and the other is a movable type, which is a different mold. However, a moving lens having high sensitivity and high power for the zoom finder performance is moved by the first cam surface 54a, and the power is reduced with low sensitivity. The movable lens having a weak
There is no problem if it is moved by b.

In the case of a three-dimensional cam formed in two stages as shown in FIG. 10, a parting line is set on the outer peripheral surface of the three-dimensional cam 56 in the same manner as in FIG. If the first cam surface 56a and the second cam surface 56b are arranged on the side of the small gear 57, the two dies can be operated with high precision using the same mold.

Next, returning to FIG.
Reference numeral 0 includes not only the above-described zoom finder but also a distance measuring optical system. That is, a light projecting unit 60 that irradiates infrared light toward a subject for distance measurement is disposed on the left side of the zoom finder, and a light projecting unit that collects light emitted by the light emitting element is located on the left side of the first lens 41. An optical lens 61 is provided.
On the other hand, a light receiving unit 65 for receiving infrared light reflected from a subject is disposed on the right side of the zoom finder, and a light receiving lens 66 for condensing light to the light receiving element is disposed on the right of the first lens 41. .

Usually, a light projecting element is arranged behind the light projecting lens, and a light receiving element is arranged behind the light receiving lens. However, in the present invention, the reflecting mirrors are arranged at an angle of about 45 degrees behind the light projecting lens 61 and the light receiving lens 66, respectively, to reflect the light from the light projecting element at about 90 degrees and to reduce the received light. The light is reflected at approximately 90 degrees and guided to the light receiving element.

FIGS. 11 and 1 show the reason for this construction.
2 will be described.

FIG. 11 is a longitudinal sectional view of the light emitting unit.
Light emitted from the light emitting element 62 disposed below is reflected by the reflecting mirror 6.
The light is reflected at substantially right angles at 3 and condensed by the light projecting lens 61,
The light is emitted toward the subject. Comparing the present invention arranged in this way with the prior art in which the light projecting element 62 shown by the two-dot chain line is arranged behind the light projecting lens 61, the L1 of the present invention is more It is clear that it is smaller than the technology L2. Therefore, it greatly contributes to thinning of the camera.

FIG. 12 is a longitudinal sectional view of the light receiving unit.
The infrared light reflected by the subject is condensed by a light receiving lens 66 and is reflected by a reflecting mirror 67 at a substantially right angle to form a light receiving element 68
Incident on. Comparing the present invention arranged in this way with the prior art in which the light receiving element 68 indicated by the two-dot chain line is arranged behind the light receiving lens 66, the dimension L3 of the present invention is smaller in the lateral direction than in the prior art. It is clear that it is smaller than L4. Therefore, also in this case, it greatly contributes to making the camera thinner.

In the present invention, both are extended in the vertical direction from the prior art. However, in the zoom finder using the porro prism as described above, the reflected light path has two vertical directions.
It becomes a step and requires some space in the vertical direction,
Since the light projecting unit and the light receiving unit are adjacent to the zoom finder, an increase in the height direction does not affect the external dimensions of the camera at all.

By providing the reflecting mirrors in the light projecting unit and the light emitting unit in this way, not only the front and rear dimensions of both units are shortened, but also as shown in FIGS. As a result, a dead space that becomes substantially triangular occurs. In order to realize a microminiature camera, it is desirable that all spaces are effectively used and no dead space occurs.

Therefore, in the present embodiment, as shown in FIG. 5, a battery chamber 71 for accommodating a cylindrical battery is arranged near the back surface of the reflecting mirror 67 in the light receiving unit 65. Since the cylindrical battery is arranged horizontally, the external shape of the battery chamber is also substantially circular, and the dead space on the back surface of the reflecting mirror can be effectively used as shown in FIG.

FIG. 13 is a longitudinal sectional view of the light receiving unit 65 and the battery chamber 71. In the light receiving unit 65, the same members as those in FIG. Incidentally, reference numeral 69 denotes a leaf spring for supporting the reflecting mirror 67, and reference numeral 70 denotes an eccentric pin for adjusting the position of the light receiving element 68.

The cylindrical battery B is housed inside the battery chamber 71, but a cylindrical lithium battery is preferable. The opening of the battery chamber 71 is shielded by a battery lid 72 shown in FIG. Although not shown, a negative electrode contact piece is provided in the back of the battery chamber, and a positive electrode contact piece is provided on the battery lid 72. Since there is no other opening in the battery chamber 71, the stored cylindrical battery B is completely sealed. Therefore, even if the cylindrical battery B leaks, it does not flow to the light receiving unit 65 or the like. , Battery room 7 for repair
Only one needs to be replaced.

In the above-described light projecting unit 60, the light projecting element 62 is arranged below the reflecting mirror 63, but may be arranged above. In this case, the back surface of the reflecting mirror 63 in the light projecting unit 60 is used. The battery room 71 may be arranged in the vicinity.

Further, from the viewpoint of effective use of dead space, a main capacitor for a strobe may be arranged horizontally instead of the battery chamber 71.

The front side wall of the battery chamber 71 receives subject light, detects subject brightness, and uses C for automatic exposure control.
A light receiving element made of dS or the like can be arranged. That is, the battery compartment 71 in FIG.
, And the light receiving element 73 is arranged as shown in FIG. The finder unit 40 is provided with a light receiving window 40a penetrating for light receiving.

Further, as shown in FIG. 5, a holding portion 71b for holding a reflector of the strobe light emitting portion is provided on a side surface of the battery chamber 71.
Are provided above and below to hold the rear surface of a reflector (not shown).

Further, a trigger transformer or the like for applying a high voltage to a trigger electrode of a discharge tube for emitting a strobe light may be mounted on the side surface of the battery chamber 71.

Further, a red-eye reduction lamp can be mounted.

As described above, the battery chamber 71 is simply a cylindrical battery B
Not only can be accommodated, but also an arbitrary light emitting element or light receiving element can be mounted on the side wall for positioning.

Next, in the camera loaded with the APS film, a desired print size is arbitrarily selected from a classic size, a high definition size, and a panorama size by an external operation, and the information is magnetically recorded on the APS film. The configuration will be described with reference to FIGS.

FIG. 14 is a top view of a mechanism for selecting each print size. FIG. 14A shows a classic size, FIG. 14B shows a high definition size, and FIG. 14C shows a panorama size. is there. In each figure, reference numeral 81 denotes a print size switching member,
The operation portion 81a is projected outward from 2a. Reference numeral 83 denotes a switch operating member which rotates about a support shaft 84, and an operating pin 85 erected at the tip of the first arm 83a is engaged with a forked portion 81b provided on the exterior member 82. Reference numeral 86 denotes an integrated switch, and the switch operating member 83 rotates to move the second arm 83 b to the movable portion 86 of the integrated switch 86.
By pressing a, 86b, an internal switch linked to the pressed movable part is turned on or off, and a predetermined signal is output. In FIG. 15, the second arm 83b of the switch operating member 83 is connected to the movable portion 86a of the integrated switch 86.
FIG. 4 shows an enlarged side view in which only one is pressed. Reference numeral 87 denotes a finder image frame switching member.
The third partial gear 83c meshes with the third partial gear 83c, and switches the view frame of the finder using a well-known mechanism (not shown) according to the moving position.

In such a mechanism, when the operation portion 81a of the print size switching member 81 is slid to the left with respect to the long hole 82a of the exterior member 82 as shown in FIG. Operating pin 85 and first arm 83a
The switch operating member 83 is rotated clockwise through the switch. Then, the second arm 83b pivots on the integrated switch 86 and presses both the movable part 86a and the movable part 86b, so that the integrated switch 86 outputs a classic size signal. Also, the partial gear 83c and the rack 87
The finder image frame switching member 87 is moved upward in FIG.

Next, as shown in FIG. 14B, the operation unit 81a
When the lever is slid to the substantially center with respect to the long hole 82a, the forked portion 81b rotates the switch operating member 83 counterclockwise via the operating pin 85 and the first arm 83a. Then, the second arm 83 b is moved to the movable portion 8 of the integrated switch 86.
Since only 6a is pressed and the pressing of the movable portion 86b is released, the integrated switch 86 outputs a Hi-Vision size signal. Then, the finder image frame switching member 87 is moved slightly downward in the figure by the partial gear 83c.

Further, when the operating portion 81a is slid rightward with respect to the elongated hole 82a as shown in FIG.
1b rotates the switch operating member 83 further counterclockwise via the operating pin 85 and the first arm 83a. Then, the second arm 83b is connected to the movable portion 8 of the integrated switch 86.
Since neither the 6a nor the movable portion 86b is in contact, the integrated switch 86 outputs a panoramic size signal. Further, the finder image frame switching member 87 is provided by the partial gear 83c.
Is moved to the bottom of the figure.

In the state shown in FIG. 14A, the second
Alternatively, only the movable portion 86b may be pressed by the arm portion 83b.

FIG. 16 is a circuit block diagram for magnetically recording on an APS film by a magnetic head based on a signal from an integrated switch.

The internal switches 91 and 92 are operated by the movable portion 86a and the movable portion 86b of the integrated switch 86,
The signal is output to the microcomputer 93. In the microcomputer 93, based on the input signal, the classic size,
Either a high-vision size signal or a panorama size signal is output to the magnetic information recording circuit 94, which outputs a recording signal to the magnetic head 95, and the magnetic head 95 magnetically records the signal on the magnetic layer of the APS film F. I do.

Here, each print size will be described with reference to FIG. The portion surrounded by the long side A and the short side B shown by the solid line is the HDTV size, and the part surrounded by the long side C that shields both ends of the long side A and the short side B shown by the short broken line is It is a classic size, and a portion surrounded by a long side A and a short side D indicated by a long broken line by shielding both ends of a short side B is a panorama size.

Therefore, the finder image frame switching member 8 described above is used.
7, the at least two light shielding plates are driven, and the field frame in a state where the light shielding plates are retracted is set to an A × B HDTV size. It becomes a × B classic-size field frame, and if the light-shielding plate is shielded only from above and below the high-vision size field frame, it becomes an A × D panorama-size field frame.

In the simple camera, the light-shielding plate including the finder image frame switching member 87 and its interlocking members are omitted, the field of view of the normal finder is set to A × B, a short broken line indicating a classic size and a panorama. A long broken line or the like indicating the size may be displayed on the field frame.

Further, a light-shielding plate for shielding light only in the vertical direction or the horizontal direction may be provided, and the remaining size may be indicated by the line as described above.

[0098]

According to the camera described in claims 1 to 4,
Since the three-dimensional cam is arranged in the dead space of the real image type zoom finder, the size of the camera can be reduced, and zooming of the real image type zoom finder can be performed with high accuracy.

According to the camera of the fifth aspect, in addition to the above-described effects, adjustment and inspection of the real image type zoom finder can be performed by the unit, so that the production efficiency is improved.

According to the camera of the present invention, the cam surface and the gear for rotating the cam surface can be molded by the same mold with respect to the variable power lens which strongly affects the finder performance. Since a parting line does not occur, zooming operation can be performed with high precision.

According to the camera of the eighth aspect, the two cam surfaces and the gear for rotating the two cam surfaces can be molded by the same mold, and since there is no parting line on the cam surfaces, zooming is performed with high precision. Can work.

According to the camera of the ninth to tenth aspects,
Since a cylindrical battery or a main capacitor for a strobe, which is a large component, can be efficiently arranged, it greatly contributes to downsizing of a camera.

According to the camera of the present invention, since the cylindrical battery which is a large part can be efficiently arranged, it greatly contributes to the miniaturization of the camera and even if liquid leakage occurs in the cylindrical battery. It does not affect peripheral members.

According to the camera of the fifteenth to seventeenth aspects, each element can be mounted in a battery chamber to form a unit.
Production efficiency is improved.

According to the camera of the eighteenth to twentieth aspects, a highly reliable configuration can be obtained when a print size is selected by an external operation and magnetically recorded on the APS film.

[Brief description of the drawings]

FIG. 1 is a diagram of a conventional integrated three-dimensional cam and gear.

FIG. 2 is a diagram of a conventional integrated three-dimensional cam and gear.

FIG. 3 is a longitudinal sectional view of a zoom lens barrel.

FIG. 4 is a step zoom diagram.

FIG. 5 is a perspective view of a zoom lens barrel, a zoom finder unit, and the like.

FIG. 6 is a perspective view of an objective lens and the like of the real image type zoom finder.

FIG. 7 is a sectional view of a real image type zoom finder.

FIG. 8 is a development view of a second cam groove of the cam member.

FIG. 9 is a diagram of an integrated three-dimensional cam and gear.

FIG. 10 is a diagram of an integrated three-dimensional cam and gear.

FIG. 11 is a vertical sectional view of the light emitting unit.

FIG. 12 is a longitudinal sectional view of the light receiving unit.

FIG. 13 is a longitudinal sectional view of a light receiving unit and a battery chamber.

FIG. 14 is a top view of a mechanism for selecting each print size.

FIG. 15 is an enlarged side view of the second arm and the integrated switch.

FIG. 16 is a circuit block diagram for magnetically recording on an APS film.

FIG. 17 is an explanatory diagram of each print size.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fixed body 2 cam cylinder 13 rectilinear guide plate 31 second cam pin 32 cam member 40 finder unit 42 second lens 42 f third cam pin 43 third lens 43 f fourth cam pin 45 porro prism 45 d third reflecting surface 54, 56 stereo cam 54 a First cam surface 54b Second cam surface 55, 57 Small gear 60 Light emitting unit 63, 67 Reflector 65 Light receiving unit 71 Battery compartment 83 Switch operating member 86 Integrated switch B Cylindrical battery

Claims (20)

[Claims] 1. An objective lens comprising a fixed lens and a movable lens, which performs zooming by moving the movable lens in the direction of the optical axis, and a first reflecting surface for reflecting a subject image emitted from the objective lens at right angles. A second object for reflecting the subject image reflected on the first reflecting surface at a right angle and projecting the light parallel to the optical axis of the objective lens and in the opposite direction.
A reflecting surface, a third reflecting surface for reflecting the subject image reflected on the second reflecting surface at right angles and emitting the reflected light in a direction orthogonal to the optical axis of the objective lens, and a subject image reflected on the third reflecting surface A fourth reflecting surface that reflects the light at a right angle and emits the light parallel to the optical axis of the objective lens; and an object image reflected by the fourth reflecting surface is incident and enlarged, and is emitted to a position corresponding to the photographer's pupil A camera equipped with a real image type zoom finder having an eyepiece that performs zooming, wherein a lens barrel that holds a zoom lens as a zoom lens and performs a magnification operation in the optical axis direction and a member that moves straight in the lens barrel is provided. A cam member having a cam pin, a cam engaging with the cam pin, and a large gear, and moving only in a direction orthogonal to the optical axis of the photographing lens; a small gear meshing with the large gear; It is formed integrally coaxially with A solid cam is moved in the optical axis direction serial moving lens, at least the three-dimensional cam at the lower of the objective lens,
And a camera arranged near the back surface of the third reflecting surface. 2. The cam pin and the cam of the cam member are engaged during the magnification change operation of the photographing lens, and the cam pin and the cam of the cam member are disengaged during the focusing operation of the photographing lens. The camera according to claim 1, wherein: 3. The camera according to claim 1, wherein the cam member is formed in an arc shape along an outer periphery of the lens barrel. 4. The first reflection surface, the second reflection surface, and the third reflection surface.
The camera according to any one of claims 1 to 3, wherein the reflection surface is provided by a Porro prism. 5. The device according to claim 1, wherein the small gear and the three-dimensional cam are mounted on a finder base that holds an optical system from the objective lens to the eyepiece. The camera according to. 6. A three-dimensional cam for moving a zooming lens of a zoom finder in an optical axis direction by a gear rotating with the zooming operation of the zoom lens and a cam surface integrally formed with the gear and provided in an axial direction. Wherein the outer diameter of the shaft adjacent to the gear is equal to or larger than the outer diameter of the peak of the gear, and the outer diameter of the three-dimensional cam adjacent to the shaft is The cam surface is formed larger than the outer diameter of the shaft, and the cam surface is formed on the gear side,
A camera, wherein a parting line is arranged on an outer peripheral surface of the three-dimensional cam. 7. The three-dimensional cam is provided on a first side provided on the gear side.
The two zooming lenses are moved by the cam surface of the zoom lens and the second cam surface provided on the side opposite to the gear, and the zooming of the first cam surface which has a stronger influence on the performance of the zoom finder. 7. The lens according to claim 6, wherein the lens is moved.
The camera according to. 8. The three-dimensional cam is formed in two stages, and two cam surfaces are provided on the gear side.
The camera according to. 9. A light-emitting element that emits infrared light toward a subject, or a light-receiving element that receives infrared light reflected by a subject, and infrared light from the light-emitting element or infrared light to the light-receiving element. A light-collecting lens for condensing light; and a reflector disposed between the light-emitting element or the light-receiving element and the light-collecting lens and reflecting emission light or incident light at a substantially right angle; A camera characterized in that a cylindrical battery or a strobe main condenser is horizontally arranged near the back surface of the camera. 10. The camera according to claim 9, wherein a cylindrical battery or a strobe main condenser is horizontally arranged adjacent to the back surface of the reflector. 11. A light-emitting element that emits infrared light toward a subject, a light-receiving element that receives infrared light reflected by a subject, and infrared light from the light-emitting element or infrared light that is emitted to the light-receiving element. A light-collecting lens for condensing light; and a reflector disposed between the light-emitting element or the light-receiving element and the light-collecting lens and reflecting emission light or incident light at a substantially right angle; A camera, characterized in that a battery chamber for accommodating a cylindrical battery is arranged horizontally long in the vicinity of the back surface of the camera. 12. The camera according to claim 11, wherein a battery chamber for accommodating the cylindrical battery is disposed horizontally long adjacent to the back surface of the reflector. 13. The camera according to claim 9, wherein the light emitting element or the light receiving element is arranged facing a bottom direction of the camera. 14. The camera according to claim 11, wherein the stored battery is sealed by shielding an opening of the battery chamber with a battery lid. 15. A light-emitting element that emits predetermined light toward a subject or a light-receiving element that receives reflected light of the subject is disposed on a side wall of the battery chamber. 9. The camera according to claim 1. 16. The camera according to claim 15, wherein the light emitting element is a discharge tube that emits strobe light, and is disposed on a side surface of the battery chamber together with a reflector. 17. The camera according to claim 15, wherein the light receiving element is an automatic exposure light receiving element that receives subject light and detects subject brightness. 18. An APS film is loaded and a desired print size is arbitrarily selected from a classic size, a high-definition size, and a panorama size by an external operation.
A camera for magnetically recording on an S film, comprising: a switch actuating member that is rotated by an external operation; and two movable parts, and the printing is performed based on whether at least the two movable parts are pressed by the switch actuating member. An integrated switch for outputting a signal corresponding to a size, wherein information of a selected print size is magnetically recorded on an APS film based on a signal of the integrated switch. 19. The camera according to claim 18, wherein the movable portion of the changeover switch operates in a direction substantially orthogonal to a rotation direction of the switch operation member. 20. The rotation of the switch actuating member,
20. The camera according to claim 18, wherein the field frame in the viewfinder is switched in accordance with the selected print size.